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Some connectors can carry both audio and video signals simultaneously:

HDMI combines DVI-compliant uncompressed video data with compressed or uncompressed audio, and supports other protocols.

FireWire is used on Camcorders, commonly ones using MiniDV tapes, and high-end audio equipment.

Digital Media Port a connector proposed by Sony on its audio/video products

DisplayPort carries digital audio and video, as well as auxiliary information

Mini DisplayPort smaller form factor of display port that performs the same function

Thunderbolt

Unified Display Interface (UDI)

Mobile High-Definition Link (MHL)

F connectors are used with RF modulators for televisions without direct inputs

SCART, now the most common in Europe

TRS phone connectors with more than one ring, or Sony's hybrid RCA with a TRS pin

Coaxial cable/RG-6/RG-59/Cable television (CATV)

Other composite connectors that carry video, audio, power, and USB:

ADC, now-defunct Apple Display Connector

Apple 30-pin dock connector, a docking cradle for Apple iPod, iPhone and iPad

Portable Digital Media Interface (PDMI) - includes DisplayPort for digital video and audio, analog audio, USB 3.0, and power

USB-C — can include USB 3.1, DisplayPort, Thunderbolt, superMHL, HDMI, and power; as well as analog audio with an adapter

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RCA connectors, also known as phono connectors or phono plugs, are used for analog or digital audio or analog video. These were first used inside pre-World-War-II radio-phonographs to connect the turntable pickup to the radio chassis. They were not intended to be disconnected and reconnected frequently, and their retaining friction was quite sufficient for their original purpose. Furthermore, the design of both cable and chassis connectors was for minimum cost. Initially intended for audio frequency connections only, the RCA plug was also used for analog composite video and non-critical radio-frequency applications.

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XLR connector plugs and sockets are used mostly in professional audio and video electronics cabling applications. XLR connector are also known as Cannon plugs after their original manufacturer. They are used for analog or digital balanced audio with a balanced line

Digital audio interfaces and interconnects with the AES/EBU interface also normally use an XLR connector.

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INTERFACE - Tips Tricks and How-To - Audio Cables and Connections

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Become a Patron of my YouTube channel... http://www.patreon.com/scottydonline http://www.youtube.com/interfacewebcast email: scott@scottydonline.com twitter: @scottydonline JC breaks down the differences between balanced and unbalanced audio lines and the connections to bring it all together. http:/live.scottydonline.com

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S/PDIF (Sony/Philips Digital Interconnect Format). Via coaxial or optical cables.
example : RCA Jack (coaxial),
TOSLINK (optical),
BNC (rare)

AES3 (also known as AES/EBU)
example : RCA Jack (coaxial),
XLR (shielded twisted pair),
TOSLINK (optical),
BNC

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Pro Audio cables and connectors - an overview

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This video covers what I feel are the most commonly found cables and connectors in the pro audio industry as of late 2015: XLR aka Cannon, XLR combo Phone, aka TS, TRS, 1/4", 6.35mm, guitar, jack Minijack aka miniTRS, 1/8", 3.5mm Phono aka RCA, cinch Minijack to RCA & Minijack to 1/4" adapter cables Neutrik Speakon (4 and 8 pole) & speakon couplers XLR to TRS adapters XLR gender change adapters XLR splitter cables Video also covers the male/female naming convention used in Pro Audio and provides some tips and advice on the use of the various types of connectors.

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Often unmarked on consumer audio equipment since it is so common, or labelled with headphones symbol or as "line out". Computers and other equipment sometimes use Microsoft-Intel color coding scheme, especially when there are multiple input/output plugs.
example: 3.5 mm TRS minijack
Balanced audio
example: 6.35 mm TRS audio jack (shielded twisted pair),
XLR (shielded twisted pair)

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is a single-wire (one conductor) electrical connector used for joining wires to equipment. The term 4 mm connector is also used, especially in Europe, although not all banana connectors will mate with 4 mm parts, and 2mm banana connectors exist. Various styles of banana plug contacts exist, all based on the concept of spring metal applying outward force into the unsprung cylindrical jack to produce a snug fit with good electrical conductivity.

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Some of these connectors, and other types of connectors, are also used at radio frequency (RF) to connect a radio or television receiver to an antenna or to a cable system; RF connector applications are not further described here. Analog A/V connectors often use shielded cables to inhibit radio frequency interference (RFI) and noise.

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There are three HDMI connector types. Type A and Type B were defined by the HDMI 1.0 specification. Type C was defined by the HDMI 1.3 specification.

Type A is electrically compatible with single link DVI-D. Type B is electrically compatible with dual link DVI-D but has not yet been used in any products.

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🔹 1/4 - inch
🔹 3.5mm
🔹 3.5mm Optical Mini
🔹 Banana
🔹 RCA
🔹 TOSLINK
🔹 XLR

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Audio interfaces and video interfaces define physical parameters and interpretation of signals. For digital audio and digital video, this can be thought of as defining the physical layer, data link layer, and most or all of the application layer. For analog audio and analog video these functions are all represented in a single signal specification like NTSC or the direct speaker-driving signal of analog audio. Physical characteristics of the electrical or optical equipment includes the types and numbers of wires required, voltages, frequencies, optical intensity, and the physical design of the connectors. Any data link layer details define how application data is encapsulated (for example for synchronization or error-correction). Application layer details define the actual audio or video format being transmitted, often incorporating a codecs not specific to the interface, such as PCM, MPEG-2, or the DTS Coherent Acoustics codec. In some cases, the application layer is left open; for example, HDMI contains an Ethernet channel for general data transmission.

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Audio encompasses a large number of interfaces including digital and analog. These are used in a number of applications from home theater and portable use to the pro audio mixing boards that DJ's and other audio professionals use. One similarity that most audio connector types share is they are easy to connect. Manufacturers of consumer electronics prefer to use simple interfaces that average users can connect and disconnect without having to tighten thumbscrews, or release tabs or latches. This preference can prove challenging to manufacturers who must balance convenience with performance.