Jinja is a popular templating engine for the Python programming language. It allows developers to create dynamic web pages by combining HTML with Python code. With Jinja, you can easily insert variables, control structures, and loops into your templates, making it simple to generate content based on user input or database queries. One of the key features of Jinja is its ability to separate the presentation layer from the application logic. This means that designers can work on the HTML templates without needing to understand the underlying Python code. Overall, Jinja enhances the development process by promoting clean and maintainable code.