# Application connectors



Application connectors let you connect external platforms such as Klaviyo, Salesforce, and Mailchimp to import and export user data, and send events.

They are written in Go. Each connector is a Go module that implements the methods required by the platform capabilities you choose to support.

A connector does not need to support every capability. It can support reading records, writing records, sending events, or any combination of these. Define the supported capabilities in `ApplicationSpec`, then implement the required methods for each one.

## Concepts

<ul class="cards" data-columns="2">
  <li>
    <a href="/docs/create-integration/application/start-with-ai-agents" title="Learn how to use AI agents to create a connector">
      <div>Start with AI agents &#10024;</div>
      <p>Use AI agents to help you create a connector faster.</p>
    </a>
  </li>
  <li>
    <a href="/docs/create-integration/application/connector-basics" title="Learn the core concepts behind application connectors">
      <div>Connector basics</div>
      <p>Learn the foundations you need to build a connector.</p>
    </a>
  </li>
  <li>
    <a href="/docs/create-integration/application/rate-limits-and-retries" title="Learn how to define rate limits and retry behavior">
      <div>Rate limits and retries</div>
      <p>Define rate limits and retry behavior for your connector.</p>
    </a>
  </li>
  <li>
    <a href="/docs/create-integration/application/sync-users" title="Learn how to sync user records between Krenalis and an external application">
      <div>Sync users</div>
      <p>Read users from the external app and create or update user records.</p>
    </a>
  </li>
  <li>
    <a href="/docs/create-integration/application/send-events" title="Learn how to send events to an external application">
      <div>Send events</div>
      <p>Send behavioral events to the external application.</p>
    </a>
  </li>
  <li>
    <a href="/docs/create-integration/application/set-up-oauth" title="Learn how to configure OAuth for a connector">
      <div>Set up OAuth</div>
      <p>Configure OAuth authentication for your connector.</p>
    </a>
  </li>
</ul>