What is Scope?

Scope determines where variables are accessible in JavaScript. There are three types of scope.

• Global Scope: Variables declared outside any function are available everywhere.
• Function Scope: Variables declared inside a function are only available within that function.
• Block Scope: Variables declared with let or const inside a block `{}` are only accessible inside that block.

let globalVar = "I am global";

function example() {
  let functionVar = "I exist inside this function";
  
  if (true) {
    let blockVar = "I exist inside this block";
    console.log(blockVar); // Works
  }

  console.log(functionVar); // Works
  console.log(blockVar); // Error (blockVar is not accessible here)
}

console.log(globalVar); // Works