Firebase is a platform developed by Google that helps developers build and manage mobile and web applications. It provides a variety of tools and services, such as real-time databases, authentication, and cloud storage, making it easier to create apps without needing to manage complex server infrastructure. With Firebase, developers can quickly add features like user sign-in, data synchronization, and analytics to their applications. This allows them to focus on creating a great user experience while Firebase handles the backend processes. Overall, it's a powerful solution for anyone looking to streamline app development.