A 1/4-inch audio jack, also known as a 6.35 mm jack, is a type of electrical connector commonly used for audio equipment. It features a cylindrical shape and is typically found on headphones, musical instruments, and professional audio gear. The size allows for a secure connection, making it popular in both consumer and professional settings. These jacks can come in two main types: mono and stereo. Mono jacks carry a single audio channel, while stereo jacks transmit two channels, allowing for a richer sound experience. The 1/4-inch audio jack is favored for its durability and ease of use, especially in live sound and studio environments.