If you're refering to camera filters, these are discs of material that attach to the end of a camera lens to provide better capture of a scene, by altering what light passes through.
e.g a neutral density graduated filter is darker towards one side, so that a scene with a bright area and a dark area (typically a landscape with a bright sky and a darker foreground) can be exposed without the foreground being to dark or over exposing the bright sky.
As cameras have limited dynamic range (the difference between the darkest and brightest levels they can capture without distortion) this kind of filter reduces these differences making sure the highlights aren't 'blown out' and that the darkest areas retain detail.
I do like the idea of getting a UV filter for every lens though. They're relatively cheap and protect the front glass element of your lens/help keep it clean, etc.
Trying to fill the unforgiving minute
with sixty seconds' worth of distance run.
Filters are of many types and it can be used depending on the situation like for correcting the color, macro filter which is used for zooming(macro), star filter is used for showing twinks on to the product like jewellery, polorizer filter is used to enhance the blue color (like in sky) into the photo.
Bookmarks