When executing scripts in an HTML page, the page ends up unresponsive until the script is done. A web worker is a JavaScript that keeps runs in the background, independently of different contents, without influencing the execution of the page.
Be that as it may, an HTML5 web worker is a script (for example JavaScript) that continues executing in the background. In the meantime, the user can interact with the page and won’t feel any performance degradation.
HTML5 web worker regularly exists in external files and utilized for long-running CPU intensive tasks yet without influencing the User Interface or different scripts.