Hi there! A unique user is someone who visits a website or uses an app but is only counted as one person, even if they visit multiple times. Imagine if you had a toy box and every time you played with it, you counted how many times you played. But if you were the only one playing with the toy box, you would only count as one person. That's kind of what a unique user is. It helps website owners and app developers know how many different people are using their product, instead of just counting every single time someone uses it. Does that make sense?