Could you explain the concept of variable scope in programming?

Variable scope is the part of a program where a variable is accessible for use.

In programming, variables can have different scopes:

• Local scope — the variable is declared inside a function or block and is only accessible there.
• Global scope — the variable is declared outside functions and is accessible throughout the program.
• Class scope (in object-oriented programming) — class member variables are accessible within the methods of that class.

For example, in Dart (Flutter), a local variable inside a function is not visible outside:

void example() {
  int x = 10; // x is only visible inside example
}

// x is not accessible here

Understanding scope helps avoid errors with variable redefinition and manage data lifetime.