What is the difference between jcr:primaryType and jcr:mixinTypes?

Question

I am just curious to know what is the difference between jcr:primaryType and jcr:mixinTypes, and why exactly does jcr:mixinTypes is used ? what does it signifies ? If you check

Answer 1

Mixin Types are similar to interfaces, one node could have multiple mixin types.

You can enable features for your node with mixins, for example tagging, see: Taggable content