what is mean "UTF-8"

Question

what is mean "UTF-8" ? that is it..

Answer 1

"UTF-8 is a character encoding capable of encoding all possible characters, or code points, defined by Unicode and originally designed by Ken Thompson and Rob Pike. The encoding is variable-length and uses 8-bit code units."
https://www.w3schools.com/charsets/ref_html_utf8.asp

Answer 2

UTF-8 is one of characters encoding familly. You will often face characters encoding but I'm not specialist of the question, hope someone can provide you more details.