I am IT student & have an assignment with $2$ areas that need to be answered, network security subject.

$1$:What is the difference between a message digest and a message authentication code $($MAC$)?$

$2$: Compare symmetric and asymmetric encryption in terms of key usage, speed, key distribution, and use cases,?

I appreciate your support for answering it by a human not AI$,$ my university has a restrection rules of using AI with advanced AI detection tools, thank you.