The App Framework constitutes the next generation of extensibility options for Contentful and evolves the concept of UI extensions. Apps help everyone — including people without a technical skillset — to install and configure extensions more easily than before.
Contentful apps are packages that simplify customization or integration by modifying your space. An app can help adapt Contentful to individual business processes and integrate with other services.
Every app has access to the SDK, which makes it possible to read and write most of the data in a Contentful space.
Check out the App Framework documentation for tutorials how to build apps and how to migrate UI extensions to apps.