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A Trusted Execution Environment is a segregated area of memory and CPU that’s protected from the rest of the CPU by using encryption. Any code outside that environment can’t read or tamper with the data in the TEE. Authorized code can manipulate the data inside the TEE.

learn.microsoft.com

Trusted Execution Environment (TEE)

This article helps you to understand what the TEE is and what it includes.

It protects what’s running in it from the rest of the CPU, but it still processes data in the clear. It’s a step up from not using it, but it’s still possible to exfiltrate data from TEEs since the data is decrypted.