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Headphones can be used both with fixed equipment such as CD or DVD players, home theater, personal computers and with portable devices (e.g. digital audio player/mp3 player, cell phone, etc.). Some cordless earphones do not need to be connected via a wire, receiving a radio or infrared signal encoded using a radio or infrared transmission link, like FM, Bluetooth or Wi-Fi. These are actually made of powered receiver systems of which the earphone is only a component, these types of cordless earphones are being used more frequently with events such as a silent disco or Silent gig.
Headphones are widely used for listening to audio sources for recreation. In the professional audio sector headphone are used in live situations by disc jockeys with a DJ mixer and sound engineers for monitoring signal sources. In radio studios, DJs use a pair of earphones when talking to the microphone while the speakers are turned off, to eliminate acoustic feedback and monitor their own voice. In studio recordings, musicians and singers use headphones to play along to a backing track. In the military, audio signals of many varieties are monitored using headphones.
Wired headsets are attached to an audio source. The most common connectors are 1/4' and 3.5 mm stereophonic jack plugs and sockets. The older 1/4' standard is used on professional equipment, and is often used on fixed equipment.
There are many different types of headset designs, with the listening situation and the needs of the listener determining what type of headphone will be used. Generally, headphone formfactors can be divided into four separate categories: circumaural, supra-aural, earbud, and in-ear.