Data duplication occurs when identical CRM records are unintentionally created, leading to redundant entries and inaccurate reports. Common causes include human errors, system integration issues, and inconsistent data entry practices. For instance, importing customer lists from multiple sources without deduplication checks can result in duplicate contacts. CRM systems use automated duplicate detection tools to identify and merge redundant records. Businesses implement data hygiene best practices, such as unique identifiers and validation rules, to prevent duplication. Reducing duplicate data improves CRM efficiency, enhances reporting accuracy, and prevents unnecessary storage costs.