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

# Understanding Key Terms

- [What is an IP Address?](https://browsify.gitbook.io/browsify-docs/understanding-key-terms/what-is-an-ip-address.md)
- [What are Proxy, VPN, and TOR?](https://browsify.gitbook.io/browsify-docs/understanding-key-terms/what-are-proxy-vpn-tor.md)
- [What is an ISP?](https://browsify.gitbook.io/browsify-docs/understanding-key-terms/what-is-an-isp.md)
- [What is a Referrer?](https://browsify.gitbook.io/browsify-docs/understanding-key-terms/what-is-referrer.md)
- [What is a User Agent?](https://browsify.gitbook.io/browsify-docs/understanding-key-terms/what-is-a-user-agent.md)
- [What is a Visitor ID?](https://browsify.gitbook.io/browsify-docs/understanding-key-terms/what-is-a-visitor-id.md)