# Data Connectors ## Data Connectors Connectors are the interface between an external data source and Squirro. They ensure that any new content from the source system is delivered to Squirro automatically. ### Built-in Connectors Squirro offers many built-in connectors out of the box. See [Built-In Data Connectors](built-in/index.md#data-loading-connectors-built-in). These include the following connectors: - [CSV Connector](built-in/csv.md#data-loading-connectors-csv) - [Documents Connector](built-in/documents.md#data-loading-connectors-documents) - [Excel Connector](built-in/excel.md#data-loading-connectors-excel) - [Squirro Connector](built-in/squirro.md#data-loading-connectors-squirro) You can also find documentation on popular [Cloud Connectors](cloud/index.md#data-loading-connectors-cloud) and [Enterprise Connectors](one-click/index.md#data-loading-connectors-one-click). ### Custom Connectors To learn more about building custom connectors, see the following resources: - [How To Write a Custom Data Loader Plugin](../how-to/custom-loader.md#data-loader-custom-loader) - [How To Write a Custom 1-Click Connector](../how-to/custom-connector.md#data-loader-custom-connector)