Lightning Components Developer Guide

What is the Lightning Component Framework?
What is Salesforce Lightning?
Why Use the Lightning Component Framework?
Components
Events
Open Source Aura Framework
Browser Support Considerations for Lightning Components
My Domain Is Required to Use Lightning Components in Your Salesforce Org
Using the Developer Console
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
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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My Domain Is Required to Use Lightning Components in Your Salesforce Org

You must deploy My Domain in your org if you want to use Lightning components in Lightning tabs, Lightning pages, as standalone apps, as actions and action overrides, as custom Lightning page templates, or elsewhere in your org.

When My Domain isn’t deployed in your org, user interface controls related to Lightning components may be hidden or inactive. Lightning components added to pages, tabs, and so on, don’t run and may be omitted, or display a placeholder error message.