Labels: Names used to label loops and control flow

Labels in Node.js (and JavaScript) are used to name a statement, typically for controlling the flow of loops or conditional statements. Labels can be particularly useful for breaking out of or continuing a specific loop when you have nested loops. 

outerLoop: for (let i = 0; i < 3; i++) {
  for (let j = 0; j < 3; j++) {
    if (j === 1) {
      break outerLoop; // Exits the outer loop when j equals 1
    }
    console.log(`i = ${i}, j = ${j}`);
  }
}

Here outer for loop is given a Label.

Usage in break and continue: Labels are used with break or continue to exit or skip specific loops. They are most commonly used in nested loops.

Label outerLoop: Marks the outer loop.

break outerLoop;: Exits the outerLoop when j equals 1, skipping any further iterations of the outer loop.

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