> For the complete documentation index, see [llms.txt](https://docs.contentsync.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.contentsync.com/what-is-contentsync.md).

# What is ContentSync?

## The Spreadsheet

Content is organized into keys and versions in a spreadsheet. The first column is always the keys, and every other column is a content version. Each row has a content key.

![](/files/-MDfi9RlOcRx8wBvApl0)

### Content Version

> A **Content Version** is a collection of content. These are columns on a spreadsheet.

### Content Key

> A **Content Key** is a unique identifier of a piece of content.  These are rows on a spreadsheet.

## Transferring Content

Content can be updated in both directions [**Push**](/what-is-contentsync.md#upload) and [**Pull**](/what-is-contentsync.md#download). Updating only a portion of a design is known as a **Selective Push** or **Selective Pull** since it will only update the selected design layers.

### Push

A Push transfers content from a design file to a spreadsheet. This will automatically create any missing content keys in the spreadsheet for the design layers that are pushed.

![A Push updates the spreadsheet with the contents of a design.](/files/-MDfYkxLK2yIpFJgFpQ3)

### Pull

A Pull transfers content from a spreadsheet into a design. The design will be updated with the chosen content version.

![A Pull updates a design with the content from a spreadsheet.](/files/-MDfiibm-iwrZVYzFfiM)