Having fresh fast and responsive refresh rate on a website is important. The refresh rate is the number of times in a second that a display hardware updates its buffer. This is distinct from the measure of frame rate which means updating with new data. People usually care about how fast and something is and most people are impatient when it comes with time.So with your web you want people to be going true it fast so they feel like its not so difficult to navigate threw it. So if a refresh rate is 120 Hz, it means that the image is refreshed 120 times per second. In theory, the more pictures per second, the more realistic the motion or video should appear.