An acceptance letter is a formal written document sent by an individual to confirm their acceptance of an offer or invitation. Commonly used in job offers, academic admissions, or event invitations, it includes a brief statement of acceptance, gratitude, and any necessary next steps. For a job offer, it typically reaffirms the position, start date, and agreed-upon terms. For academic or event purposes, it confirms participation and may outline further instructions. The tone is professional and appreciative, reflecting enthusiasm and commitment.