> 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="/pages/Y2IsUat9ACinL4Zo9zs6">/pages/Y2IsUat9ACinL4Zo9zs6</a></td></tr><tr><td><strong>Peg-out (tgBTC Withdraw)</strong></td><td></td><td></td><td></td><td><a href="/pages/QvgPikLOTKSpt1hI6cIz">/pages/QvgPikLOTKSpt1hI6cIz</a></td></tr><tr><td><strong>Additional Components and Security Mechanisms</strong></td><td></td><td></td><td></td><td><a href="/pages/VIKWpCpSaOncitMKRv5w">/pages/VIKWpCpSaOncitMKRv5w</a></td></tr></tbody></table>