In photography, shutter speed or exposure time is the length of time when the film or digital sensor inside the camera is exposed to light, also when a camera's shutter is open when taking a photograph. The amount of light that reaches the film or image sensor is proportional to the exposure time. A camera takes a photograph by exposing a digital sensor (or a piece of film) to light. The shutter is simply a barrier that keeps light out when you’re not taking a photo. Pressing the button at the top of the camera (it’s actually called the shutter release) opens the shutter, and when the shutter is open, an image is recorded. When the shutter closes, the camera stops recording. The shutter speed, then, is just how long that barrier stays open to let light into the image. Shutter speed is how long an image is exposed to light — it can be milliseconds, or even minutes.
Fast Shutter Speed
Slow Shutter Speed
Best Picture
I personally prefer this picture, because it clearly shows fast shutter speed, as you can see the water drops. Furthermore, this image shows aperture, as it is focused on the cup and water drops rather than focusing the background with it. Also this image has the correct exposure.
Worst Picture
I think this is my worst picture because the angle doesn't capture the water drops, which is what I was hoping for. The shutter speed is also too slow and didn't give me the best result. In addition, I should change the aperture so that it is only focuses on the cup and the water drops.