Backend-as-a-Service (BaaS) is a cloud platform that automates backend development, allowing developers to focus on frontend tasks while outsourcing server management. It offers a range of features including scalable databases, APIs, and user authentication, reducing development time and costs. Despite its benefits, BaaS may limit flexibility and customization, potentially leading to vendor lock-in, and is best suited for applications like MVPs or simpler apps with less complex integrations.