The Lightning connector is a proprietary interface developed by Apple for connecting devices like the iPhone, iPad, and iPod. Introduced in 2012, it replaced the older 30-pin dock connector and features a compact design that allows for reversible insertion, meaning it can be plugged in either way. This connector supports various functions, including charging, data transfer, and audio output. It is used with a range of accessories, such as headphones, chargers, and docks, making it a versatile option for users of Apple products.