This document discusses usability testing, including what it is, why it's important, and the typical process. Usability testing ensures software meets its intended purpose by testing it with real users. It evaluates factors like efficiency, learnability, and satisfaction. There are various testing strategies like guerilla testing and contextual inquiry. The typical process involves planning sessions, recruiting participants, designing tasks, running sessions, and analyzing insights. Usability testing can find bugs and hidden issues to improve the user experience.