To enjoy your music without disturbing your surroundings, headphones are perfect. They contain small loudspeakers that are placed close to the user’s ear. Headphones are connected to audio sources like amplifiers, radio, DACs etc. by wires but there are also wireless versions. Headphones are usually equipped with a 1/4 inch (6.35mm) or 1/8 inch (3.5mm) phone jack for plugging the headphones into the sound source. To prevent unwanted noise disrupting your music, some headphones have a noise cancellation system. Active noise-cancelling headphones use a microphone to detect unwanted noise which is played back in phase-reverse. In this way background noise is cancelled out. When you go to buy a set of headphones, it is important that you pay attention to the audio quality and the wearing comfort. Audio quality should be outstanding but don’t underestimate the wearing comfort. Since you are probably going to wear it for some time, a pair of headphones should be very comfortable.