In JavaScript, the trim() method is used to remove whitespace (spaces, tabs, or newlines) from both ends of a string. Here's how you can use it: let str = " Hello, World! "; let trimmedStr = str.trim(); console.log(trimmedStr); // Output: "Hello, World!" It doesn't modify the original string; instead, it returns a new string with the whitespace removed. This method is commonly used to clean up user input or to remove unnecessary whitespace from strings obtained from external sources before further processing.