With the digitization of the recruitment process, every emerging, as well as the established firm, uses online mediums for publishing job openings. Now just imagine, thousands of companies under the same domain, publishing a couple of same job opening on different websites, and as a consequence when a job seeker searches for that particular job online, millions of search results popping up. A huge mess for the poor job seeker!
More information: https://recruitingblogs.com/profiles/blogs/what-google-for-jobs-can-do-for-you-amp-your-company