One standout feature of the Canon Speedlite 320EX is its built-in LED light. Unlike the flash tube, this is a continuous light source, so it’s especially useful for video where constant illumination is needed. It can also help as a basic modeling light, letting you preview how light falls on your subject before taking the shot.

In practical use, the LED can serve as a small fill light for close subjects, help with focusing or visibility in Live View, and act as a general-purpose light in dark environments. It’s not a replacement for a powerful dedicated video light, but it can be handy for casual clips, close-up work, or low-light situations.

The question also mentions wireless slave use and flash release, but the provided answers only explain the LED feature, so those functions aren’t confirmed here. In general, learning how and when to use a flash off-camera, plus understanding continuous light versus flash, can help improve your lighting results.