I'm looking to buy a flash for my DSLR (t4i) but I don't really know much about external flashes besides the fact that I need E-TTL/TTL. I haven't yet learnt how to manually control the flash but I'm ...

Temporarily emitting light is what the flash does. When photographing dimly lit scenes, such as those that occur indoors or at night, you can use the flash’s light to compensate for the lack of ...