A TPM is a microchip designed to provide basic security-related functions, primarily involving encryption keys. The TPM is usually installed on the motherboard of a computer or laptop, and communicates with the rest of the system using a hardware bus.
Trusted Platform Module (TPM) Services is a new feature set in Microsoft ®Windows Vista™ and Windows Server® Code Name "Longhorn" used to administer the TPM security hardware in your computer. TPM Services architecture provides the infrastructure for hardware-based security by providing access to and application-level sharing of the TPM.