It's a TV show on PBS. People bring antiques to be appraised, and an expert tells them what they have, what's special about it, and how much it could be worth. The fun ones have someone coming in like "this was my grandmother's cabinet growing up and I haven't thought twice about it" and then the appraiser telling them "this was made by the most famous carpenter in 1890's Massachusetts, it's worth $20,000" or similar stories.