WTForms is a flexible forms validation and rendering library for Python web development, enabling developers to create and validate web forms with ease. It provides a wide range of form fields, validators, and integrates seamlessly with web frameworks like Flask and Django. The library emphasizes reusability and security, offering features such as CSRF protection to safeguard applications. WTForms supports dynamic form creation and custom widget design, making it a versatile solution for both simple and complex form handling needs.