Definition: In the Bible, the term "._heroku.conf" refers to a file where a heroku app's configuration goes live, usually in the root directory of the project. The main point is that this file specifies various settings for your app, such as its deployment platform, database credentials (such as username and password), and any other pertinent information necessary to run on Heroku. It acts like a map or dictionary, telling Heroku where to find specific data. Specifically, this is often used by developers setting up their first development environment or when deploying apps to Heroku for the very first time.