-Web 1.0: in the early days, Internet users had only one role: to consume information hosted on computer servers. Browsing was purely textual and queries were very limited. When the web programming language HTML (Hyper Text Markup Language) appeared, the organisation of the elements displayed on the screen became more attractive. However, interactions were still very limited because the user could only read the information and not comment on it, for example.
-Web 2.0: Around the year 2000, the term Web 2.0 began to be used to promote interaction between websites and users. The Internet is understood as a collaborative platform, in which all users participate. Now, in addition to reading, Internet users can also generate information and publish it on websites, in user forums, blogs, social networks and wikis (pages that can be edited by any user).
-Web 3.0: This refers to the fact that web pages can be related semantically, adding metadata that adds value to the information and improves the search and the possibility of finding information on the web by understanding the meaning of words.
-Web 4.0: The Internet can function in a predictive way, no longer just receiving commands from the user, but through the use of artificial intelligence can anticipate user requests and even predict future behaviour. Voice interactions are also becoming more widespread, with the use of smart devices that allow spoken searches.
2.0 tools are those apps, programs or websites available to carry out certain functions within the Internet, and which can be applied to other vital aspects, such as learning or teaching. Some examples are:
Social networks. Virtual communities in which people at a distance can communicate in real time in writing (chat), can make their information publicly available and connect with other people who share their interests, their history or their desires (including romantic ones).
Wikis. Sites of free access to information through the voluntary accumulation of knowledge, in the manner of the old encyclopaedias, but this time organised in a collaborative way: each user contributes his or her grain of sand.
Blogs. One-person or group pages that serve as a diary, publication or literary text, to share various forms of text and stories (including audio visual) using Internet tools and receiving feedback from readers or followers.
Image and video hosting sites. The best known of these is Youtube, a platform where users can upload various audio visual content and share their opinions, comments and tastes in the field, or even become broadcasters and commentators, known as "youtubers".
Online sales pages. Services not only for sales, but also for exchanging opinions among buyers and contacting companies offering goods or services. The best known of these are Amazon and eBay.
Podcasts. Radio is not dead, but exists in Web 2.0, in the form of podcasts: broadcasts stored online that allow users to listen to them whenever and wherever they want, often offering knowledge, tutorials or simply entertainment programmes.
Online presentations. Inspired by the PowerPoint programme, these sites offer presentation services for companies, schools and universities, allowing the audio visual and multimedia potential of the Internet to be used in a variety of everyday areas.
Online and collaborative office: On the Internet you can find online office automation tools, which include, among other things, word processors that can be used without being installed on the computer. In addition to word processors, they include spreadsheets and presentation software. They also allow collaborative work by sharing editable documents.
Content managers: They allow the creation of complete, easily editable and configurable web pages. They enable collaborative work and communication. They are usually free or low cost and are open source.