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

# Welcome to Cardano Testnets

<figure><img src="/files/CMSr3PHKCrK4pmelfBdR" alt=""><figcaption></figcaption></figure>

Testnets provide Cardano SPOs, developers and users with a place to break things before they go live on Mainnet.&#x20;

Supporting the Testnets with infrastructure is a key component of an SPO's contribution to the Ecosystem. If you would like to help the Testnets, please read on!