This is the newest preferred way to connect your digital audio signals from a CD player or DVD player, a/v receiver through a fiber optic connection.
TOSLINK-Toslink is a connection format for fiber optic digital audio cables. A fiber optic digital audio cable carries audio data in the form of light impulses instead of electrical signals. Dolby Digital surround sound receivers, digital disc (DVD's) and compact disk (CD) players, satellite dish receivers you will find the Toslink interface on some of these types of equipment.
Mini OPTICAL- Mini-optical jack this type of jack is commonly used for the digital audio input and output of portable audio devices. A mini-optical jack is the same shape and size as a standard analog audio mini-jack. This allows portable Mini-Disc recorders to use a single input jack that accepts both mini-optical connectors and standard analog audio mini-jacks. The MD portable detects whether you're making a digital or an analog connection based on the type of cable you're using, and automatically selects the appropriate recording mode.
3.5mm AUDIO CABLES- 3.5mm Stereo Audio cables connect the 3.5mm jack from CD players, stereos, speakers, PC/TV tuners and other audio devices. These cables are fully shielded to prevent unwanted EMI/RFI interference.
2.5mm this connector is mostly used in cell phones and hands free head sets for phone systems.
1/4" plug- This connector also known as Phone Audio is used in applications for your 1/4" headphones or speaker plug into a 1/4 "jack with this connector. 1/4" Plugs (Male) and Jacks (Females) also are used to connect a Guitar to an Amplifier.
A multi-pin shielded audio connector (typically 3 pins) used in microphone, line level and snake cable audio connections, also found in the basic microphone audio