What is software as a service?
The launch in 1999 of Salesforce, a computer program for managing customer relations, marked the beginning of a new chapter in the history of software. Prior to the appearance of Salesforce, to run software on any given computer you typically had to first install the software on that particular machine.
Salesforce was different because it did not require any such local installation. Instead, to use the program all a user had to do was connect to the internet then log in to Salesforce through a web browser.