Ember build output (dist folder)

In Ember JS project, we have package.json (for NPM managed) and bower.json (Bower managed) where we have all our dependencies/devDependencies (e.g. bootstrap, jquery, ember, etc)

Now these get downloaded from their respective registries and get downloaded locally into node_modules/bower_components folder.

Now my question is while these folders (node_modules/bower_components) contain a lot of code dependencies, when we do a build, I see some code in the "dist" folder. I want to understand what actually goes into this dist ? I see things like vendor.css, vendor.js, myappName.css, myappName.js, etc

So how do these get constructed and what code actually goes inside these ? Is it also base on what we have in our package/bower json config files ? Or is it based on what we have in ember-cli-build.js ?