Airbnb is an online marketplace that connects people looking to rent their homes with travelers seeking accommodations. Hosts list their available spaces and set prices, while travelers can browse listings, refine searches, and book accommodations. Both hosts and guests benefit from Airbnb's large network and customer-friendly features that aim to build trust, including public profiles, reviews, and a host guarantee of up to $1 million. However, risks remain such as potential property damage or lack of refunds for travelers.