A computer is an electronic machine capable of processing information following the instructions in a program. Initially, manipulated information through hydraulic machines.

At present, the term personal computer is known to workstations and laptops. Before the arrival of the latter, the term is used exclusively for PCs.

Types

·  The workstations (PCs) are characterized by its membership into three parts: the CPU, which is a box where they are the major components that make operating the PC, monitor or screen and the keyboard.

There are several models depending on the placement and size of the CPU:

- Desktop: is a tower to lay flat on top of a table.

- Minitorre: has some approximate dimensions of 35 cm. high, 13 cm. in width and 39 cm. background.

- Semitorre: its dimensions are approximately 43 cm. high 18 cm. in width and 44 cm. background.

- Torre: measured 60 cm. high, 26 cm. in width and 54 cm. some background.

·  The portable computers are one piece in which screen, keyboard and CPU are united. They have small dimensions, more or less the size of a folder. Its components have to be introduced within the casing or attached externally via the USB port.

Other types

The barebones computers are sold only with the basic components such as the motherboard, power supply and the box.

They have a size reducidísimas but also are sold to larger structures. From this structure, the buyer can go by adding components such as RAM or a hard drive.