XLR

XLR connectors are commonly used for microphone or DI box output for balanced signals. They can also output stereo signals, depending on the selection. If used as a balanced cable, it can only carry a mono signal, while for stereo cables, it can only output unbalanced signals. XLR and TRS both have three pins and their basic functionalities are similar.

TS/TRS/TRRS

Although TS, TRS, and TRRS connectors may look similar, their functionalities differ. TRS stands for Tip, Ring, and Sleeve, representing different pins. TS connectors have 2 pins and can carry unbalanced or mono signals. TRS connectors have 3 pins and can carry balanced or stereo signals. TRRS connectors have 4 pins and are commonly used for dual-channel earphones with a microphone input. The black insulating ring in the middle is responsible for separating the different pins.

Mini TS/TRS/TRRS

Also known as Mini Phone Jack, 3.5mm, 1/8 inch, or Mini-Jack.

The functionalities of 3.5mm and 6.3mm connectors are the same, but visually, 6.3mm connectors are easier to identify and more durable. 3.5mm connectors are smaller in size and suitable for use with compact devices like smartphones.

RCA

Also known as Phono Plug.

RCA connectors are mainly used for transmitting stereo signals. They are usually connected to the RCA/Mini TRS input on the other end to input stereo signals, and the red and white connectors are used to output the left and right audio channels, respectively. Other than that, there is nothing particularly noteworthy about RCA connectors.