Apartment List is an online platform that connects renters with property managers and landlords to simplify the apartment rental process. It operates on a performance-based model, charging property managers a fee only when a renter successfully moves in, which reduces financial risk. The platform enhances visibility for listings through partnerships, such as with Facebook Marketplace, and offers various touring options like in-person and virtual tours. The goal is to create a user-friendly experience that benefits both renters and property managers.