There are three main types of resume formats: chronological, functional, and combination. The chronological format lists work experience in reverse order, starting with the most recent job. This format is ideal for those with a strong work history in a specific field. The functional format focuses on skills and qualifications rather than work history, making it suitable for those with gaps in employment or changing careers. The combination format merges both styles, highlighting skills while also providing a chronological work history. Each format serves different needs and can help job seekers present their qualifications effectively.