Today’s IT infrastructure is composed of five major components

System software

Application software

Data management software

The principal storage technologies are

magnetic disk

magnetic tape

A USB flash drive

Optical Discs

CD- ROM ( compact disk read- only memory)

Digital video discs ( DVDs)

Input devices

output devices

Cloud computing

Cloud computing consists of three different types of services

operating system.

Software As a Service ( SaaS)

open source software