Just like electricity and the phone, IT is becoming a utility whereby you can rent software and access shared hardware without having to buy it and install it on premise. Some of the biggest players are:
Google Suite, a suite of applications for mainly messaging, communication and collaboration that competes with major apps such as Microsoft Office, Exchange and Sharepoint.
Office 365 cloud enabled its Microsoft Office platform and made it available through its Office365 product. It includes Exchange, Sharepoint, Outlook, Office and Teams. Microsoft also provides its .NET & SQL Platform As A Service through its Azure product.
Hubspot provides an Integrated Online Marketing Tool that enables businesses to implement Inbound Marketing as an alternative to the traditional Outbound Marketing that most companies still use.
Salesforce is one of the pioneers of Software As A Service by providing a web based CRM app and transitioned to also a Platform As A Service and Marketing Automation.
On top of being in traditional ERPs, SAP is now also a leader in cloud enabled ERP & CRM apps and is providing them through a suite of products like SAP by Design and S/4 Hana.
Amazon provides you the Infrastructure As A Service and Platform As A Service which basically means that you can rent servers and a development platform to host or develop your own custom apps without having to have your own infrastructure and without having to worry about crashing when you have surges in demand. That way you don’t have to pay to buy a lot of capacity that would be unused most of the time.