Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
App Overview
Designing App UI
Creating App Templates
Using the AppCache
Distributing Applications and Components
Styling Apps
Developing Secure Code
Using JavaScript
Using Apex
Lightning Data Service
Testing Components with Lightning Testing Service
Debugging
Fixing Performance Warnings
Reference
PDF

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App Overview

An app is a special top-level component whose markup is in a .app resource.

On a production server, the .app resource is the only addressable unit in a browser URL. Access an app using the URL:

https://<myDomain>.lightning.force.com/<namespace>/<appName>.app, where <myDomain> is the name of your custom Salesforce domain