Nextdoor is a social networking platform designed for neighborhoods. It allows residents to connect with their neighbors, share local news, and discuss community issues. Users can post about events, recommendations, and safety concerns, fostering a sense of community. The platform is accessible through a website and mobile app, requiring users to verify their address to ensure they are part of the local neighborhood. Nextdoor also offers features like local business recommendations and a marketplace for buying and selling items within the community.