Phoenix Web Development

The most important directory: lib

Now we'll move on to the real meat of our Phoenix application: lib. Lib is where our application lives. By default, our Phoenix application is broken into two separate ideas. Using the application name of Sampler as an example, we will see two directories: lib/sampler and lib/sampler_web. The idea behind this is that every web application in Phoenix has at least two separate applications that work together to get the job done. The first is divorced from the idea of anything web-related, so there are no controllers or templates, JSON, or anything similar. One of the most common patterns that you’ll see here is all of your database-specific Ecto logic through contexts and schemas.

A context is a collection ...