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

# Key Concepts

### Jump right in

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-cover data-type="files"></th><th data-hidden></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Peg-in (BTC Deposit)</strong></td><td></td><td></td><td></td><td><a href="/docs/whitepaper/key-concepts/peg-in-btc-deposit.md">Peg-in (BTC Deposit)</a></td></tr><tr><td><strong>Peg-out (tgBTC Withdraw)</strong></td><td></td><td></td><td></td><td><a href="/docs/whitepaper/key-concepts/peg-out-tgbtc-withdraw.md">Peg-out (tgBTC Withdraw)</a></td></tr><tr><td><strong>Additional Components and Security Mechanisms</strong></td><td></td><td></td><td></td><td><a href="/docs/whitepaper/key-concepts/additional-components-and-security-mechanisms.md">Additional Components and Security Mechanisms</a></td></tr></tbody></table>