Applicant Tracking Systems are similar to CRM (Customer Relationship Management) Systems, and are online software that exist for recruitment needs. Through an ATS, jobs can be posted onto multiple Job Boards, and applications which come in can be filtered into different categories, for example Job Board, date of application, or ranking.
More information: http://www.recruitingblogs.com/profiles/blogs/everything-you-need-to-know-about-applicant-tracking-systems
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