Web usability is the measure of how easy it is for someone who visits your website or app to find what they are looking for and complete tasks. A website or app is considered usable when it is easy for people to use, understand, and navigate. It is important for websites and apps to have good web usability because if it is difficult to use, people may become frustrated and leave. Good web usability can also help people find what they need quickly and easily, resulting in more visitors returning and more conversions.