Jinja2 is a modern and designer-friendly templating engine for the Python programming language. It allows developers to create dynamic web pages by combining static HTML with dynamic data. Jinja2 uses a simple syntax that makes it easy to insert variables, control structures, and filters into templates, enhancing the flexibility of web applications. One of the key features of Jinja2 is its ability to separate the presentation layer from the business logic. This separation helps maintain clean code and improves collaboration between developers and designers. Jinja2 is widely used in popular web frameworks like Flask and Django, making it a valuable tool for web development.