An audio jack is a small hole or port on electronic devices that allows you to connect headphones, speakers, or other audio devices. It lets you listen to sounds from your device through external speakers or headphones. Full definition
Power / volume rocker are on the right side, 3.5 mm audio jack on the top and micro USB port at the button. (gogi.in)
There's a six - speaker audio system with AM / FM radio, a USB port, and an auxiliary audio jack for connecting mobile devices and playing digital media from them. (dupagechryslerdodgejeepram.com)
The only other port on the whole machine is a 3.5 mm audio jack on the left. (laptopmag.com)