Photographic filters are like fancy glasses that you put in front of a camera lens to change the way a picture looks. Just like how you can see things in different colors when you wear tinted glasses, these filters can make a picture look redder, bluer, or even black and white.
Some filters can also help fix problems with the picture, like making it less blurry or reducing glare from bright lights.
To use a filter, you just screw it onto the front of the camera lens and take a picture like you normally would. It's like putting on a different hat to change your look - but for your camera!