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Digital Computers are computers that operate in binary modes. That is data is
represented in zeros (0s) and ones (1s).

Kinds of Digital Computers

Mainframe Computers
Super Computers
Mini Computers
Micro Computers

Mainframe Computers
Mainframe is very large in size and is an expensive computer capable of
supporting hundreds or even thousands of users simultaneously.

Mainframe Computer

Mainframe executes many programs concurrently and supports simultaneous
execution of programs. Mainframe computers are high speed and large storage
capacity computers.

Super Computers
Supercomputers are one of the fastest computers currently available.
Supercomputers are very expensive and are employed for specialized

applications that require immense amount of mathematical calculations. For
example, weather forecasting, scientific simulations, (animated) graphics,
electronic design, etc.