Shutter Speed aka (exposure time) , stands for the length of time a camera shutter is open to expose light into the camera sensor - is one of the three pillars of photography, the other two being ISO and Aperture
How to Choose a Camera Shutter Speed. The shutter speed is the amount of time the shutter allows light to pass through the lens to the film or digital sensor. A correct combination of exposure settings – shutter speed, lens aperture, and I.
This Chart Shows How Aperture, Shutter Speed, and ISO Affect Your Photos