A follow-up email is a message sent after an initial communication, typically in a professional or business setting, to continue the conversation or request a response. It serves as a polite reminder or a way to provide additional information or clarification. A well-crafted follow-up email can help maintain a professional relationship and ensure that important matters are not overlooked. It is often used to follow up on a previous meeting, inquiry, or request, and can be a valuable tool in effective communication and relationship building.