Instruction: Describe what context processors are and how they are used in Django templates.
Context: This question probes the candidate's understanding of Django's template rendering system and the use of context processors to inject data into templates globally.
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For instance, let's say we're working on a Django project where we need to display user-specific information on every page, such as a sidebar with the user's name and a list of notifications. Instead of manually adding this data to the context of every single view function, we can leverage a context processor to add this data globally. This way, every template automatically has access to these variables, making our code cleaner, DRY (Don't Repeat Yourself), and more efficient.
Context processors work by taking a HttpRequest object as their input and returning a dictionary...