Is there any way to stop a camera from clipping through walls?

Self explainatory. I need to make a good camera script, but the camera keeps clipping through walls.

This has to do with the camera subject. When set to the character's humanoid (which is default), the camera is affected by physical objects such as parts that may be in its way. If, for example, you set it to their torso, it will disregard those objects, moving through them. If your camera is doing this, you have made some change to it at some point, and you'll need to set it back if you don't want these effects.