Computer hardware is a collective term used to describe any of the physical components of an analog or digital computer. The term hardware distinguishes the tangible aspects of a computing device from software, which consists of written, machine-readable instructions or programs that tell physical components what to do and when to execute the instructions.

Computer hardware can be categorized as being either internal or external components. Generally, internal hardware components are those necessary for the proper functioning of the computer, while external hardware components are attached to the computer to add or enhance functionality.


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External hardware components, also called peripheral components, are those items that are often externally connected to the computer to control either input or output functions. These hardware devices are designed to either provide instructions to the software (input) or render results from its execution (output).

Hardware refers to the computer's tangible components or delivery systems that store and run the written instructions provided by the software. The software is the intangible part of the device that lets the user interact with the hardware and command it to perform specific tasks. Computer software includes the following:

However, malware can affect the system in other ways. For example, it can consume a large portion of the computer's memory or even replicate itself to fill the device's hard drive. This slows down the computer and may also prevent legitimate programs from running. Malware can also prevent users from accessing the files in the computer's hardware storage.

Hardware virtualization is the abstraction of physical computing resources from the software that uses those resources. Simply put, when software is used to create virtual versions of hardware instead of using physical, tangible hardware components for some computing function, it is known as hardware virtualization.

Sometimes referred to as platform or server virtualization, hardware virtualization is executed on a particular hardware platform by host software. It requires a virtual machine manager called a hypervisor that creates virtual versions of internal hardware. This enables the hardware resources of one physical machine to be shared among OSes and applications and to be used more efficiently.

In cloud computing, hardware virtualization is often associated with infrastructure as a service (IaaS), a delivery model that provides hardware resources over high-speed internet. A cloud service provider (CSP), such as Amazon Web Services or Microsoft Azure, hosts all the hardware components that are traditionally present in an on-premises data center, including servers, storage and networking hardware, as well the software that makes virtualization possible.

This makes IaaS and CSPs different from hardware as a service (HaaS) provider that hosts only hardware but not software. Typically, an IaaS provider also supplies a range of services to accompany infrastructure components, such as the following:

While it's common for individuals or businesses to purchase computer hardware and then periodically replace or upgrade it, they can also lease physical and virtual hardware from a service provider. The provider then becomes responsible for keeping hardware up to date, including its various physical components and the software running on it.

The biggest advantage of HaaS is that it reduces the costs of hardware purchases and maintenance, enabling organizations to shift from a capital expense budget to a generally less expensive operating expense budget. Also, since most HaaS offerings are based on a pay-as-you-go model, it makes it easier for organizations to control costs, while still having access to the hardware they need for their operational and business continuity.

The customer may either pay a monthly fee for using the MSP's hardware, or its use may be incorporated into the MSP's fee structure for installing, monitoring and maintaining the hardware. Either way, if the hardware breaks down or becomes outdated, the MSP is responsible for repairing or replacing it.

Computer hardware includes the physical parts of a computer, such as the case, central processing unit (CPU), random access memory (RAM), monitor, mouse, keyboard, computer data storage, graphics card, sound card, speakers and motherboard.[1][2]

By contrast, software is the set of instructions that can be stored and run by hardware. Hardware is so-termed because it is hard or rigid with respect to changes, whereas software is soft because it is easy to change.

Hardware is typically directed by the software to execute any command or instruction. A combination of hardware and software forms a usable computing system, although other systems exist with only hardware.

A storage device is any computing hardware and digital media that is used for storing, porting and extracting data files and objects. It can hold and store information both temporarily and permanently and can be internal or external to a computer, server or any similar computing device. Data storage is a core function and fundamental component of computers. Dedicated storage devices include RAIDs and tape libraries.

When using computer hardware, an upgrade means adding new or additional hardware to a computer that improves its performance, increases its capacity, or adds new features. For example, a user could perform a hardware upgrade to replace the hard drive with a faster one or a solid state drive (SSD) to get a boost in performance. The user may also install more Random Access Memory (RAM) so the computer can store additional temporary data, or retrieve such data at a faster rate. The user may add a USB 3.0 expansion card to fully use USB 3.0 devices, or could upgrade the Graphics Processing Unit (GPU) for cleaner, more advanced graphics, or more monitors. Performing such hardware upgrades may be necessary for aged computers to meet a new, or updated program's system requirements.

In large organizations, hardware upgrades are handled by administrators who are also in charge of keeping networks running smoothly. They replace network devices like servers, routers and storage devices based on new demands and capacities.

Because computer parts contain hazardous materials, there is a growing movement to recycle old and outdated parts.[18] Computer hardware contain dangerous chemicals such as lead, mercury, nickel, and cadmium. According to the EPA these e-wastes have a harmful effect on the environment unless they are disposed of properly. Making hardware requires energy, and recycling parts will reduce air pollution, water pollution, as well as greenhouse gas emissions.[19] Disposing unauthorized computer equipment is in fact illegal. Legislation makes it mandatory to recycle computers through the government approved facilities. Recycling a computer can be made easier by taking out certain reusable parts. For example, the RAM, DVD drive, the graphics card, hard drive or SSD, and other similar removable parts can be reused.

Many materials used in computer hardware can be recovered by recycling for use in future production. Reuse of tin, silicon, iron, aluminum, and a variety of plastics that are present in bulk in computers or other electronics can reduce the costs of constructing new systems. Components frequently contain copper, gold, tantalum,[20][21] silver, platinum, palladium, and lead as well as other valuable materials suitable for reclamation.[22][23]

Recycling of computer hardware is considered environmentally friendly because it prevents hazardous waste, including heavy metals and carcinogens, from entering the atmosphere, landfill or waterways. While electronics consist a small fraction of total waste generated, they are far more dangerous. There is stringent legislation designed to enforce and encourage the sustainable disposal of appliances, the most notable being the Waste Electrical and Electronic Equipment Directive of the European Union and the United States National Computer Recycling Act.[29]

As computer hardware contain a wide number of metals inside, the United States Environmental Protection Agency (EPA) encourages the collection and recycling of computer hardware. "E-cycling", the recycling of computer hardware, refers to the donation, reuse, shredding and general collection of used electronics. Generically, the term refers to the process of collecting, brokering, disassembling, repairing and recycling the components or metals contained in used or discarded electronic equipment, otherwise known as electronic waste (e-waste). "E-cyclable" items include, but are not limited to: televisions, computers, microwave ovens, vacuum cleaners, telephones and cellular phones, stereos, and VCRs and DVDs just about anything that has a cord, light or takes some kind of battery.[30]

Dimora Brands operates the leading brands in cabinet hardware, door hardware, faucets, accessories, and related products. Its two operating divisions, Top Knobs and Hardware Resources, are known for the industry's best product offering and service. Each of Dimora Brands divisions proudly serves kitchen cabinet dealers, kitchen and bath showrooms, custom cabinet makers, independent hardware stores, other customers, and the design community

Dimora Brands operates the leading brands in cabinet hardware, door hardware, faucets, accessories, and related products. Its two operating divisions, Top Knobs and Hardware Resources, are known for the industry's best product offering and service. Each of Dimora Brands divisions proudly serves kitchen cabinet dealers, kitchen and bath showrooms, custom cabinet makers, independent hardware stores, other customers, and the design community.

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