Analogue Computers are designed to process the analogue data. Analogue data is continuous data that changes continuously and cannot have discrete values such as speed, temperature, pressure and current.
The analogue computers measure the continuous changes in physical quantity and generally render output as a reading on a dial or scale.
Analogue computers directly accept the data from the measuring device without first converting it into numbers and codes.
Speedometer and mercury thermometer are examples of analogue computers.
Digital Computer is designed to perform calculations and logical operations at high speed. It accepts the raw data as digits or numbers and processes it with programs stored in its memory to produce output. All modern computers like laptops and desktops that we use at home or office are digital computers.
Hybrid Computer has features of both analogue and digital computer. It is fast like analogue computer and has memory and accuracy like digital computers. It can process both continuous and discrete data. So it is widely used in specialized applications where both analogue and digital data is processed. For example, a processor is used in petrol pumps that converts the measurements of fuel flow into quantity and price.