What is a rune in Go and how is it different from byte?

Hi everyone! I just started learning Go and came across a strange data type — rune. I read the documentation but still don't fully understand why it's needed. I'm trying to work with strings and iterate over them. I wrote this code: ```go package main import "fmt" func main() { s := "Привет, мир!" for i := 0; i < len(s); i++ { fmt.Printf("%c ", s[i]) } } ``` But instead of the expected characters, I got some gibberish: `П Ð Ð¸ в е Ñ , м и Ñ !`. I expected to see each character of the string in order, but the output clearly doesn't match what I wanted. Why is this happening? Then I replaced the loop with `for i, r := range s`, and everything worked correctly. The documentation says that `r` has type `rune`. Please explain: 1. What is a `rune` in simple terms? 2. What is the difference