An external flashgun for a digital SLR camera
Some digital SLR cameras have a built in pop up flash, however these units are virtually next to useless. Internal flash units are weak and not worth using, therefore an external flashgun is needed for all digital SLR cameras.
Top of the range flashguns are expensive however there is no need to drop loads of money on a top of the range flashgun when a cheaper one will suffice.
If you shop around you can get a perfectly adequate external flashgun for your digital SLR camera for under a hundred bucks.