What is TPM?

A Trusted Platform Module (TPM), is a cryptographic coprocessor with capabilities of random number generation, secure generation of cryptographic keys and managed access to these keys. It includes additional capabilities such as remote attestation and sealed storage.
TPM technical specifications are publicly available, driven by the Trusted Computing Group (TCG).
TPM 2.0 (released October 2014) adds new functionality and fixes weaknesses of the former TPM 1.2.

dTPM (Discrete Trusted Platform Module)

Discrete TPM is a microcontroller that stores encryption keys, passwords and digital certificates.
fitlet2 can be ordered with an optional discrete TPM.

fTPM is a Firmware based TPM 2.0 implementation.
Intel® PTT is an integrated solution in the Intel® Management Engine.
- The platform supports Microsoft requirements for firmware Trusted Platform Module 2.0 (fTPM).
  Specifically it supports credential storage and key management as used by Windows 8 and Windows® 10.
- Also possible in Linux to encrypt partitions using LUKS (Linux Unified Key Setup).
  See Linux: Full Disk Encryption
- Intel® PTT supports BitLocker for hard drive encryption.
fitlet2 is based on Intel Apollo Lake SoC, featuring Firmware TPM as part of Intel® Platform Trust Technology (Intel® PTT)

For more information please refer to - Intel TPM information