MongoDB Stitch is an application platform that runs alongside MongoDB Atlas, offering various services to save developers time by automating tedious tasks such as user management, database access, and triggering functions or services. It provides a solid cloud foundation of application-centric services, including user authentication, email/password authentication provider, QueryAnywhere for database access, Functions for serverless JavaScript functions, Triggers for automated change streams, and Services integration points for third-party services like Twilio and GitHub. By utilizing these services, developers can focus on building their applications without getting bogged down in chores, resulting in faster development and delivery times.