# Extending AWS AppConfig workflows using extensions
<a name="working-with-appconfig-extensions"></a>

An extension augments your ability to inject logic or behavior at different points during the AWS AppConfig workflow of creating or deploying a configuration. For example, you can use extensions to perform the following types of tasks (to name a few):
+ Send a notification to an Amazon Simple Notification Service (Amazon SNS) topic when a configuration profile is deployed.
+ Scrub the contents of a configuration profile for sensitive data before a deployment starts.
+ Create or update an Atlassian Jira issue whenever a change is made to a feature flag.
+ Merge content from a service or data source into your configuration data when you start a deployment.
+ Back up a configuration to an Amazon Simple Storage Service (Amazon S3) bucket whenever a configuration is deployed. 

You can associate these types of tasks with AWS AppConfig applications, environments, and configuration profiles.

**Topics**
+ [Understanding AWS AppConfig extensions](working-with-appconfig-extensions-about.md)
+ [Working with AWS authored extensions](working-with-appconfig-extensions-about-predefined.md)
+ [Walkthrough: Creating custom AWS AppConfig extensions](working-with-appconfig-extensions-creating-custom.md)