There’s a lot of equipment associated with photography, and wrapping your head around them (as well as finding the $$ to afford them) can be a challenge. Which ones do you actually need? What do they really do? And when should you use them?
Filters are one of the least expensive pieces of equipment, yet they can have a big impact on your photography. Besides UV filters, which protect your investment by keeping your lens glass clean, other types of filters can improve your images. Check out this post by Photography Talk for details.