ATS stands for Applicant Tracking System. It is a software application used by recruiters and employers to manage the recruitment process. It helps recruiters to identify and track applicants, store and organize their resumes and applications, and keep track of the recruitment process. ATS systems allow employers to track job postings, manage resumes, and screen resumes for keywords and phrases. The system then ranks the resumes based on how well they match the job criteria and forwards the most relevant resumes to recruiters for review.