What is backlight in photography? How to use it during shooting?

In photography, backlight refers to the light where the main light source is located behind the subject. Backlight can create many unique light and shadow effects in photography, and is a lighting method often used by photographers.

If you want to shoot with backlight, you can try placing the backlight directly behind your subject, and do not under any circumstances confuse backlight with background light - these are completely different things.