A resume is a formal document that summarizes a person's work experience, education, skills, and accomplishments. It is typically used when applying for jobs to showcase qualifications to potential employers. Resumes can vary in format, including chronological, functional, or combination styles, depending on the individual's background and the job they are seeking. In addition to work history, a resume often includes sections for contact information, a professional summary, and relevant certifications. A well-crafted resume helps candidates stand out in a competitive job market and is an essential tool for career advancement.