Data entry jobs involve inputting, updating, and maintaining data into computer systems from various sources, and require skills like fast typing, accuracy, attention to detail, and proficiency in software like MS Excel and Word. Responsibilities include verifying data, performing quality checks, organizing records, and ensuring data confidentiality. These roles can be full-time, part-time, remote, or in-office and are found in many industries, including accounting, healthcare, and general office administration.