About this interactive
A hardware security module (HSM) and a trusted platform module (TPM) do a lot of the same work: both generate random numbers, generate cryptographic keys, encrypt and decrypt, and store keys. Documentation often compares them because of that overlap.
The difference is scope. The TPM is localized: a chip on a single machine's motherboard, usually preinstalled, there for that machine's secure boot and local secure operations, and not built for high speed. The HSM takes cryptography to the enterprise level: something you buy and install, a PCIe card, a separate appliance, a dedicated server or even a USB device, for high-performance key management across an infrastructure. In a typical HSM setup, keys never leave the module, which decrypts on request and returns the data. To sort a card, ask whether it is one machine's built-in chip or purchased enterprise key-management hardware.
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