Jinja is a popular templating engine for the {Python} programming language, primarily used in web development. It allows developers to create dynamic HTML pages by embedding Python-like expressions within templates. This makes it easier to generate content that can change based on user input or other variables, enhancing the interactivity of web applications. One of the key features of Jinja is its ability to separate the presentation layer from the business logic. This means that developers can design the layout and appearance of a web page without mixing it with the underlying code. Jinja supports features like template inheritance, filters, and macros, making it a powerful tool for building complex web applications.