Computer system are also used in digital marketing and advertisement

Analog
-analog computers are computers that measure physically quantity such as temperature,pressure,length and voltage variation etc.and convert them to a numeric value.

Digital
-digital computer is a computer that performs calculations and logical operations with quantities represented as digits,usually in the binary number system.

Hybrid
-a hybrid computer is an analog computer controlled by a digital computer instead of human being.

Desktop computers
-design so that the system unit,input devices,output devices and any other devices fit intirely on or under a desk or table

Notebook Computer

• also called a laptop computer, is a portable personal computer often designed to fiton your lap.

Smart Phones

• is an Internet enabled phone that usually also provides personal information management function such as a calendar , an appointment book, an address book, a calculator, and a notepad.

PDAs

• or personal digital assistant differ s from a smartphone in that it usually does not provide phone capabilities and may not be Internetenabled , support voice input, have a built-in camera, or as a portable media player.