Lightning Components: Security, Developer Productivity, and App Reach

The Lightning Component framework powers Lightning Experience and Salesforce1. Use the framework to build mobile apps and pages in Lightning Experience, Salesforce1, Salesforce Classic, and Communities. Enhancements in this release are focused on LockerService and Content Security Policy changes, new ways to make your Lightning components available, performance and error handling improvements, and other new features for developers.
Available for use in: Contact Manager, Group, Professional, Enterprise, Performance, Unlimited, and Developer Editions

Create Lightning components using the UI in Enterprise, Performance, Unlimited, Developer Editions or a sandbox.

Use out-of-the-box components or build your own components with JavaScript, HTML, CSS, Apex, or any web-enabled code.

AppExchange lets you install components created by Salesforce partners or publish your own components.

For more information, refer to the Lightning Components Developer Guide.