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
Developing Secure Code
Validations for Lightning Component Code
Styling Apps
Using JavaScript
JavaScript Cookbook
Using Apex
Creating Server-Side Logic with Controllers
Working with Salesforce Records
Testing Your Apex Code
Making API Calls from Apex
Creating Components in Apex
Lightning Data Service
Lightning Container
Controlling Access
Using Object-Oriented Development
Using the AppCache
Distributing Applications and Components
Debugging
Fixing Performance Warnings
Reference
PDF

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Using Apex

Use Apex to write server-side code, such as controllers and test classes.

Server-side controllers handle requests from client-side controllers. For example, a client-side controller might handle an event and call a server-side controller action to persist a record. A server-side controller can also load your record data.