Buying an external flash doesn't have to be confusing. Understand these important points offered by...
Category - External Flashes
External flash units provide increased flash range, more control of light direction, faster recycle times than built-in flashes and eliminate red eye. An external flash is essential if you want to take more natural looking flash photos. Like other DSLR accessories, they come with a variety of features.
External flash units are much more versatile and powerful than built-in digital camera flashes.