Components of a Computer

Central Processing Unit (CPU)

The brains of computer that processes and calculates information required by the operating system. The CPU is attached to the motherboard.

Random Access Memory (RAM)

Primary memory of a computer that stores short term information for programs that is currently in use and demanded by the operating system. RAM is attached to the motherboard. 

Hard Disk Drive (HDD)

Secondary memory of a computer that stores long term information that is not in use by the operating system. Typically has a larger storage capacity than RAM but has a slower access speed. The HDD is connected to the motherboard but is soldered or attached to the motherboard. 


The body of the computer that connects all external and internal computers together. The motherboard connects internal components such as RAM or the CPU and external components such as USBs. Most information of a computer passes through the motherboard.

Think of motherboards as alike an Airport, a centralised location connecting passengers (computer information) to various airplanes travelling to different destinations. (components). 

Graphics Card

Processing unit for graphics that converts information to colour outputs on a display. Graphic cards often include a video output such as HDMI, VGA or DVI to connect to an external display. Graphic cards are connected to the motherboard.

Network Interface Controller (NIC)

The NIC provides a computer wired and wireless networking capabilities. NIC are connected to a motherboard.