What do you mean by Applicant Tracking System ?

Applicant tracking system (ATS), also called a candidate management system, is a software application designed to help an enterprise recruit employees more efficiently. An ATS can be used to post job openings on a corporate Web site or job board, screen resumes, and generate interview requests to potential candidates by e-mail. Other features may include individual applicant tracking, requisition tracking, automated resume ranking, customized input forms, pre-screening questions and response tracking, and multilingual capabilities. It is estimated that roughly50 percent of all mid-sized companies and almost all large corporations use some type of applicant tracking system