What are web workers and why do we need them ?

Question

I want the javascript API which could capture the screen of the client. Does anyone knows about it?

Answer 1

Web Workers allow to run JavaScript code in the background without blocking the web page user interface. Web workers can improve the overall performance of a web page and also enhance the user experience.
Web workers come in two flavors -
Dedicated web workers and Shared web workers.
For InformationWeb Workers