What does ATS stand for ? ATS – Applicant Tracking System Applicant Tracking System An applicant tracking system (ATS) is a software application that enables the electronic handling of recruitment and hiring needs. An ATS can be implemented or accessed online at enterprise- or small-business levels, depending on the needs of the organization; free and open-source ATS software is also available. Other Popular ATS Full Form / Abbreviation Anti-Terrorism Squad Automatic Transfer Switch American Thoracic Society Automated Trading System Air Traffic Services