A Bank course contains all of your content. You can manage the content in the bank, and then push any of the changes you’ve made to that content to associated courses that have content from your bank.
A Bank is like a warehouse: it’s where you store all the contents of your course. Learners don’t visit the warehouse directly. Instead, the warehouse supplies all of its stores (aka Associated Courses), and that’s where the learners go.
This makes content management across multiple courses with shared content much simpler.