Answer
Software as a service
Step-by-step explanation
Software as a service (SAAS) is a software distribution model in which a third-party provider hosts applications and makes them available to customers over the Internet. SAAS is one of three main categories of cloud computing.
Cloud computing is the use of internet to access hardware and software service instead of keeping regular physical hardware and software in the office space. Basically it is the practice of using a network of remote servers hosted on the Internet to store, manage, and process data, rather than a local server or a personal computer.