User experience professionals help make sure everything runs smoothly on a website. One way they do this is by making flowcharts, which are step-by-step sequences of functions in a computer program.
They then watch people, like you, navigate a page or pages to observe your natural habits. The user experience professionals look at things like where you first put your mouse after loading a new page. Watching your movements on a website allows them to improve it based off of their observations.