What is when someone says you look familiar?

When someone says you look familiar, it means that they have seen you before, or you resemble someone they know. It can be a positive or negative connection based on their previous experiences with someone or an object that you look like. It can also be a way for them to start a conversation with you and get to know you better. They may ask you about your background, hobbies, interests, and other personal details to clarify whether they know you or not. Some people may feel flattered by this comment, while others may feel uncomfortable if they don't remember where they know the person from.