The first commercially succesful personal computer, the Apple II, was introduced in 1977. Since then a lot has changed, but the basics of today's computer hardware remain strikingly similar to personal computers built over 20 years ago.

Imagining life without computers has become almost impossible for a large chunk of population today. But understanding its nitty-gritty is not a child's game and people often feel the need of expert professionals for smooth operation of their computers. Therefore, a career in Hardware and Networking has become a very good career option for those who have an interest in the field.

Computer hardware includes various physical parts of computer.

"Computer hardware" refers to the physical components of a computer, as opposed to the software operating system and programs that run on a computer. The key hardware components are:

CPU - The Central Processing Unit is the core of your computer. It performs the calculations, allocates memory, and coordinates the activities of all software running on the computer.
RAM - Random Access Memory is used by the CPU. More RAM means the CPU can handle more tasks at once.
Hard Drive - The hard drive stores your operating system files, applications, and the files you create with applications.
CD and DVD Drives - Useful for playback of training videos, data backup, and playing music and movies, these drives are standard on almost all new computers and can be purchased as external devices as well.
Input Devices - The keyboard and mouse are input devices. They send signals to the CPU, which are then sent to the operating system and applications, telling them what to do.
Display Devices - The most common display devices are built-in monitors on laptops and all-in-one computers, and external monitors. They receive data from a graphics c ard, which in turn receives information from the CPU. That information is then shown on the monitor screen.