Caching Drupal Renderable Arrays

Love getting to learn something new. Going through some tutorials today, I realized there's an 'easy' hook to enable caching of the renderable arrays I never knew about. What exactly is a renderable array? ... Maybe the easiest way you can think of it is structured data that needs to be transformed into html. Previously I'd been using cache_set and cache_get, but this is quicker, and a bit more flexible.

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