# Overview

Learn how to provide content for your slots.

This interface abstracts the source of a slot's content, so an implementation can serve it from wherever you keep it.

When a request to the Croct API fails, the SDK serves content from a provider instead, so your application keeps rendering. By default, it auto-discovers the [content downloaded by the CLI](/reference/cli/fallback-content) and builds a [provider](/reference/sdk/php/api/content/default-content-provider) from it, with no extra setup.

For tests, serve a fixed set of content from an [in-memory map](/reference/sdk/php/api/content/array-content-provider).

## Implementations

- [DefaultContentProvider](/reference/sdk/php/api/content/default-content-provider): Serves the content downloaded by the CLI.
- [ArrayContentProvider](/reference/sdk/php/api/content/array-content-provider): Serves content from an in-memory map.