Flask is a lightweight web framework for Python that allows developers to build web applications quickly and efficiently. It is designed with simplicity in mind, making it an excellent choice for both beginners and experienced developers. Flask provides the essential tools needed to create web applications while allowing for flexibility and customization. One of the key features of Flask is its modularity, which enables developers to use only the components they need. This makes it easy to scale applications and integrate with other libraries and tools. Flask's extensive documentation and supportive community further enhance its appeal, making it a popular choice for web development projects.