What is the difference between utf8mb4 and utf8 charsets in MySQL?

Question

What is the difference between utf8mb4 and utf8 charsets in MySQL?

I already know about ASCII, UTF-8, UTF-16

Answer 1

The utf8mb4 character set is useful because nowadays we need support for storing not only language characters but also symbols, newly introduced emojis, and so on.

A nice read on How to support full Unicode in MySQL databases by Mathias Bynens can also shed some light on this.