The Django Debug Toolbar is an indispensable tool not just for debugging, but also for tracking detailed information about each request and response. Rather than appearing only during exceptions, the toolbar is always present in your rendered page.

Initially, it appears as a clickable graphic on the right-hand side of your browser window. On clicking, a toolbar appears as a dark semi-transparent sidebar with several sections:

Each section is filled with detailed information about the page from the number of SQL queries executed to the templates that we use to render the page. Since the toolbar disappears when DEBUG is set to False, it is pretty much restricted to being a development tool.