Coldcard is a hardware wallet specifically designed for Bitcoin storage and security. It stands out for its emphasis on advanced security features and robustness. Coldcard uses open-source software, allowing users to independently verify its security and operation. The wallet is known for being air-gapped, meaning it can operate and sign transactions without needing to connect directly to the internet, thus providing an added layer of security against online threats. Coldcard targets users who prioritize high security for their Bitcoin holdings, especially those looking for a cold storage solution.