ATS (Applicant Tracking System)
Software that recruiters use to receive, parse, filter, and rank job applications. Most companies with more than ~50 employees use one. Common systems include Workday, Greenhouse, Lever, Taleo, iCIMS, and SmartRecruiters. ATS systems read your CV before any human does — if your formatting or keywords don't fit, the recruiter may never see the file.