Frame rate controls how many images, or frames, are shown each second. If something takes one second to pass in front of a camera, 5 frames per second means you will have 5 still images of that object. A higher frame rate gives you smoother motion, more images and improve the chance of not missing out on something happening in the scene.
But don’t forget that a higher frame rate will need more network bandwidth and storage space. The shutter speed is the length of time a camera’s shutter is open. This controls the amount of light reaching the sensor. In low light situations, the shutter needs to stay open longer in order for the sensor to receive enough light. A possible side effect of this is motion blur, where moving objects become blurred.