# Files

### Purpose

This documentation exists to assist you in understanding and beginning to use the StreamingFast [`substreams-sink-files`](https://github.com/streamingfast/substreams-sink-files) tool. The Substreams module paired with this tutorial is a basic example of the elements required for sinking blockchain data into files-based storage solutions.

### Overview

The `substreams-sink-files` tool provides the ability to pipe data extracted from a blockchain to various types of files-based persistence solutions.

For example, you could extract all of the ERC20, ERC721, and ERC1155 transfers from the Ethereum blockchain and persist the data to a files-based store.

It supports CSV, and Parquet format. (for ProtoJSON, use `substreams sink protojson` command: [ProtoJSON](/how-to-guides/sinks/protojson.md))

See [substreams-sink-files README](https://github.com/streamingfast/substreams-sink-files) for details


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.substreams.dev/how-to-guides/sinks/files.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.