What does && mean in JavaScript

It returns true if both conditions are true. Here's an example:

let x = 5;
let y = 10;

if (x > 0 && y > 0) {
  console.log("Both x and y are greater than 0");
}

In this example, the code inside the if statement will only run if both x and y are greater than 0. If either one is not greater than 0, the code will not execute.