Assume that we have a web based system that allows users to log in to secure areas of a web server. Such a system will have a database containing user names, passwords, and other user attributes. Assume further that the database is accessed through a third party API. We could access the database directly in every module that needed to read and write a user. However this would scatter usage of the third party API throughout the code, and would leave us no place to enforce access or structure conventions.
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