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# Usage
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---
<!-- TOC depthFrom:2 depthTo:6 withLinks:1 updateOnSave:1 orderedList:0 -->
- [Purpose](#purpose)
- [Daemon](#daemon)
- [Scanner](#scanner)
- [Signature Testing and Management](#signature-testing-and-management)
- [Configuration](#configuration)
<!-- /TOC -->
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## Purpose
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This User Guide presents an overview of the various ways that *libclamav* can be used through the tools provided by ClamAV. To learn more about how to better use each facet of ClamAV that interests you, please follow the links provided. |
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---
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## Daemon |
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---
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The ClamAV Daemon, or [`clamd`](Usage/Scanning.md#clamd), is a multi-threaded daemon that uses *libclamav* to [scan files for viruses](Usage/Scanning.md). ClamAV provides a number of tools which interface with this daemon. They are, as follows: |
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- [`clamdscan`](Usage/Scanning.md#clamdscan) - a simple scanning client |
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- [`on-access scanning`](Usage/Scanning.md#On-access-scanning) - provides real-time protection via a `clamd` instance |
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- [`clamdtop`](Usage/Scanning.md#clamdtop) - a resource monitoring interface for `clamd` |
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---
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## Scanner |
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---
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ClamAV also provides a command-line tool for [simple scanning](Usage/Scanning.md) tasks with *libclamav* called [`clamscan`](Usage/Scanning,md#clamscan). Unlike the daemon, `clamscan` is not a persistent process and is best suited for use cases where one-time scanning with minimal setup is needed. |
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---
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## Signature Testing and Management |
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---
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A number of tools allow for [testing and management of signatures](Usage/SignatureManagement.md). Of note are the following: |
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- [`clambc`](Usage/SignatureManagement.md#clambc) - specifically for testing bytecode
- [`sigtool`](Usage/SignatureManagement.md#sigtool) - for general signature testing and analysis
- [`freshclam`](Usage/SignatureManagement.md#freshclam) - used to update signature database sets to the latest version |
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--- |
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## Configuration |
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The more complex tools ClamAV provides each require some degree of [configuration](Usage/Configuration.md). ClamAV supplies two example configuration files: |
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- [`clamd.conf`](Usage/Configuration.md#clamdconf) - for configuring the behaviour of the ClamAV Daemon `clamd` and associated tools
- [`freschclam.conf`](Usage/Configuration.md#freshclamconf) - for configuring the behaviour of the signature database update tool, `freshclam` |
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ClamAV also provides a mail filtering tool called [`clamav-milter`](Usage/Configuration.md#clamav-milter) which can be attached to a `clamd` instance for mail scanning purposes.
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Additionally, a tool called [`clamconf`](Usage/Configuration.md#clamconf) allows users to check the configurations used by each other tool, pulling information from the configuration files listed above, alongside other relevant information. |