Can you explain what the arguments object in JavaScript is?

In JavaScript, the arguments object is a local variable within a function that contains all the arguments passed to it in the form of an array-like object.

Features of arguments:

• Allows access to function arguments without explicitly declaring parameters.
• Is not a true array, but has a length and indices.
• Useful for functions with a variable number of arguments.

Example of usage:

function sum() {
  let total = 0;
  for (let i = 0; i < arguments.length; i++) {
    total += arguments[i];
  }
  return total;
}

console.log(sum(1, 2, 3)); // 6

In modern JavaScript standards, it is preferable to use the rest operator (...args), which creates a true array of arguments.