> ## Documentation Index
> Fetch the complete documentation index at: https://launchdarkly-preview.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Applications in Engineering insights

> This topic explains how to work with LaunchDarkly applications in engineering insights.

> For the complete documentation index, see [llms.txt](/llms.txt). For the full documentation snapshot, see [llms-full.txt](/llms-full.txt).

## Overview

This topic explains how to work with LaunchDarkly applications in engineering insights.

Applications are a part of your codebase for which you want to track deployments. Applications often correspond to a single repository in your version control system. However, if you are using monorepos, then a single repository may contain several applications. Generally, an application is a codebase or portion of a codebase that you independently deploy.

## Create applications

Applications are created automatically when you send a deployment event to LaunchDarkly. Deployment events must include the application key and version. If the application key does not correspond to an existing application, LaunchDarkly will create a new application for you using that key.

To learn how to send a deployment event to LaunchDarkly, read [Send events from your deployment pipeline](/home/releases/config-deployment#option-2-send-events-from-your-deployment-pipeline). To learn about other ways to automatically create applications, read [Applications and application versions](/home/releases/apps-and-app-versions).

<Note title="Flag targeting rules and applications created by deployment events">
  You may have applications that are created automatically because you have sent a deployment event to LaunchDarkly. However, you will not be able to create mobile targeting rules for those applications until you have also completed the following:

  * your feature flag has its "Available on mobile SDKs" toggle set to **On**. To learn more, read [Create flags](/home/flags/create).
  * you have already started to collect application information. LaunchDarkly must receive an evaluation context with this information before it enables the option to create a mobile targeting rule. To learn more, read [Automatic environment attributes](/sdk/features/environment-attributes).

    To learn more, read [Mobile targeting](/home/flags/mobile-targeting).
</Note>

## Edit applications

You can change the display name or description for an application. The application key cannot be edited.

To navigate to the Applications page, click on your **display picture** in the top toolbar and select "Manage applications":

<Frame caption="The &#x22;Manage applications&#x22; option.">
  ![The "Manage applications" option.](https://files.buildwithfern.com/https://launchdarkly.docs.buildwithfern.com/docs/4ac78756f8721bcfc983a1d7392d2103cb00ba9b01382555cd2b992cf147f26b/assets/images/auto/eng-insights-applications-menu-callout.auto.png)
</Frame>

You are directed to the Applications page. To edit an application, follow the instructions at [Edit applications](/home/releases/applications#edit-applications).