Speed

 Speed is defined as. The rate of change of position of an object in any direction.

Shutter speed is defined as the speed the mechanical shutter on a digital single reflex lens / mirrorless camera as it closes this can be from 30 seconds to 1/8000th of a second. This speed needs to be adjusted depending on what object you are intending to capture in your photo.

In this shot I focused on the busker and set the shutter speed to a full fraction (1/8,1/6,1/4,/1/3) of a second. Notice how he is mostly in focus, the background is clear, and the people in the background are blurry.

When slowing the shutter speed to 10 second exposure while focused on water it becomes misty almost foggy

Here using a shutter speed of 1/40 I captured the Metro cruiser running code 3 (lights+sirens) on Las Vegas Blvd. Notice they are in focus but the background is blurry because I was panning the camera during this shot.

Here is another long exposure over 5 seconds

A 30 second exposure from east of Hollywood on the east side of Las Vegas. That light trail is not a meteor but a helicopter. This gives me an idea for long exposure shots with flying objects.