There are four main classifications of computers: Mainframe computers, micro-computers mini-computers, and super-computers. Here is a brief breakdown of each:
Mainframe computers are extremely powerful and large computers that have the capacity to process the activity of multiple users at one time. Many other smaller, less powerful computers (otherwise known as terminals) are networked with the mainframe, meaning they are attached to the central mainframe computer. From here, the mainframe has the capability to process and store things that come from the connected terminals.
These are most commonly known as personal computers and the computers that people use on a daily basis. Micro-computers contain their own microprocessor, which performs the job of a mainframe computer but with considerably less power as it is only required to process the activities of one machine.
Microprocessors became the most common type of processing equipment as they featured predominantly in personal computers. They had enough power to perform the basic recreational activities that people owning personal computers required. Typically, personal computers were used for playing music and movies as well as surfing the Internet and word processing amongst other things. Micro-computers are your typical laptop or desktop computers and are widely available at relatively affordable prices.
These computers fall in the gap between micro-computers and mainframe computers. They possess much more power than a micro-computer, but not enough to perform the tasks of a mainframe computer. These were developed in the 60s and gradually became less expensive as time moved on and technology became more widely available.
Super computers are the most powerful computers ever invented. They are used to process an enormous amount of terminal activity; even more than that of a mainframe computer. In fact, in the event of optimizing the performance of a mainframe computer, that will create a super computer.