What are web workers in HTML5?

Web workers in Htl are nothing but a JavaScript running in the background. It is used to perform tasks without affecting the performance and interfering with the user interface. They can also perform an I/O request using XMLHttpRequest. You can define a Worker object by using the Web worker API to run the JavaScript file.

Example

if (typeof(w) == "undefined") {
  w = new Worker("workers.js");
}

The above code runs the Web worker with the JavaScript file workers.js.