Usability testing refers to the process of evaluating a product or feature to determine how easy and intuitive it is to use. It involves observing real users as they interact with the product and gathering feedback on their experience. Think of it like having a friend test out your new recipe before serving it to a big group. By watching how they follow the instructions and noting any confusion or frustration, you can identify areas for improvement. Usability testing is a vital tool for product managers to ensure their software is user-friendly and meets the needs of their target audience.