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Alternatively referred to as a cord, connector or plug, a cable is one or more wires covered in a plastic covering that connects a computer to a power source or other device. The picture is an example of what the power cord may look like for your computer or monitor

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1. VGA (Video Graphics Array)
Created way back in the 1980’s, the VGA connection cable was the standard cable used to connect a computer to a monitor. More recently, it has faded out of popularity due to the gradual shift towards digital connections over analog. Still, if you look on any video card or display apparatus, there is a good chance you’ll see a VGA port.

VGA connections can be identified by 15 pins arranged in 3 rows with 5 on each row. Each row corresponds to the 3 different color channels used in display: red, green, and blue.

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2. DVI (Digital Visual Interface)
The DVI connection became the successor to VGA as technology moved away from analog towards digital. Digital displays, like LCD, proved to be higher quality, which soon became the market standard for home pictures. DVI connectors come in 3 varieties.

DVI-A can transmit analog signals, allowing it to be backwards compatible with VGA (useful for CRT monitors and LCDs of lower quality).

DVI-D can transmit the newer digital signals.

DVI-I is capable of both analog and digital.

In certain cases, you may need a VGA-to-DVI or DVI-to-VGA converter cable.

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3. HDMI (High Definition Multimedia Interface)
In the past decade, high-definition broadcasts became the new standard of what it means to be high quality. Unlike VGA and DVI, HDMI sends both video and audio signals together. The signals are digital only; thus, HDMI is only compatible with newer devices.

HDMI connectors come in 4 types:

Type A is the most popular. This connector can be identified by its 19 pins on the male head. Type A is compatible with single-link DVI-D connections.

Type B is larger than Type A, coming in at 29 pins on the male head. Type B is compatible with dual-link DVI-D connections.

Type C is a 19-pin connector that’s most often used with portable devices, like camcorders and digital cameras.

Type D looks similar to a micro-USB cord. It also has 19 pins.

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4. USB (Universal Serial Bus)
The USB connection is quite possibly the most pervasive connection type in today’s world. Nearly every form of computer peripheral device — keyboards, mice, headsets, flash drives, wireless adapters, etc. — can be connected to your computer through a USB port. The design has evolved over the years, which means there are multiple versions of USB available:

USB 1.0/1.1 can transmit data at speeds up to 12 Mbps.

USB 2.0 can transmit data at speeds up to 480 Mbps and is compatible with older versions of USB. At the time of this article, USB 2.0 is the most common type found in the market.

USB 3.0 can transmit data at speeds up to 4.8 Gbps. It is compatible with previous versions of USB.

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In electronics, a digital-to-analog converter (DAC or D-to-A) is a circuit for converting a digital signal (usually binary) to an analog signal (current, voltage or electric charge). Digital-to-analog converters are interfaces between the digital world and analog world. An analog-to-digital converter (abbreviated ADC, A/D or A to D) is an electronic circuit that converts continuous signals to discrete digital numbers.