What function does the `*` operator perform in Go, especially regarding pointers?

In the Go language, the * operator is used for working with pointers and performs two main functions:

1. Dereferencing a pointer — obtaining the value that the pointer points to.

2. Declaring a pointer — when declaring a variable with *, it indicates that the variable is a pointer to a type.

Example:

var a int = 10
var p *int = &a  // p is a pointer to a
fmt.Println(*p)   // outputs 10 — the value that p points to

*p = 20           // changing the value of a through the pointer
fmt.Println(a)    // outputs 20

Thus, * allows working with addresses and values in memory, providing low-level control over data.