Root of Trust (RoT) is a source that can always be trusted within a cryptographic system. Because cryptographic security is dependent on keys to encrypt and decrypt data, RoT schemes generally include a hardened hardware module. This is particularly important as the Internet of Things (IoT) proliferates, because to avoid being hacked, components of computing ecosystems need a way to determine information they receive is authentic. The RoT safeguards the security of data and applications and helps to build trust in the overall ecosystem.”]
Source: https://cpl.thalesgroup.com/faq/hardware-security-modules/what-root-trust