TrustZone technology by Arm provides a system-wide approach to security, applicable across various processors including the Cortex-A and Cortex-M series. It creates an isolated execution environment that separates secure and non-secure code, which helps to protect sensitive information and functions. The key features include Isolation of Secure and Non-Secure Worlds,  Reduced Attack Surface,  Flexible Security Implementation,  Enhanced Secure Boot,  Protection of Cryptographic Operations,  Secure Firmware Updates, and Secure Inter-Process Communication (IPC).