A Comment by @Dougee
In December 2017 Apple released hardware with the new T2 chip technology. It is found on the iMac Pro, 2018 Mac Mini, 2018 MacBook Air, and the 2018 MacBook Pro models.
The T2 integrated several other controllers including the System Management Controller (SMC), image signal processor that works with FaceTime HD, audio controller, Touch ID, Touch Bar, and SSD controller.
From a security perspective the T2 is really quite interesting. The T2 contains a Secure Enclave that provides the platform for Touch ID, Encrypted Storage and Secure Boot.