Shutter Speed
Shutter speed is, basically, how long the shutter of the camera takes to open and close. When the shutter speed is faster, it takes clearer pictures. When the shutter speed is slower, it captures more of the motion that was happening when the picture was taken. Shutter speed can also help the exposure to light. If it is bright where the picture is taken, you could choose to use a faster shutter speed to make sure not as much light is taken in and vice versa.