Deletion refers to the process of removing or erasing data, information, or content from a system or document. This can occur in various contexts, such as when a user deletes a file from their computer or when a database entry is removed. Deletion can be temporary, allowing for recovery, or permanent, making it impossible to retrieve the deleted item. In genetics, deletion describes a mutation where a segment of DNA is lost or removed. This can lead to changes in the organism's traits or functions, as the missing genetic material may contain important instructions for producing proteins. Deletions can occur naturally or be induced by environmental factors.