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title: DataLens On-premises. Overview
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  DataLens On-premises is a business analytics service. That allows you to
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  your results. This article will help you understand the relationship between
  entities and the difference between a workbook and collection.
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# About DataLens On-premises


DataLens On-premises is a business analytics tool that allows you to connect to various data sources, visualize data, create dashboards, and share your results. With DataLens, you can track your product and business metrics directly from data sources to make data-driven decisions.



## How DataLens works {#how-dl-works}


DataLens features the following entities:

* **Connection**: Parameters for accessing a data source.
* **Dataset**: Description of a dataset from a source.
* **Chart**: Data from a data source or dataset visualized as tables, diagrams, or maps.
* **Dashboard**: Complex visualization made up of charts and selectors for filtering data as well as text blocks, automatically optimized for mobile devices.
* **Report**: Document designed as an interactive presentation, where you can add charts, text blocks, headers, and images and then export it to PDF.

DataLens uses workbooks and collections to organize objects. Workbooks store connections, datasets, charts, and dashboards. Collections group workbooks and other collections for streamlined data management and navigation.