Manual filtering is a process used to sort and select data based on specific criteria set by a user. This method allows individuals to review and choose information that meets their needs, such as emails, documents, or data entries. By applying filters, users can focus on relevant content while ignoring unnecessary items. This technique is commonly used in various applications, including email clients, spreadsheets, and databases. For example, in an email client, users can manually filter messages by sender, date, or subject to find important communications quickly. Manual filtering enhances organization and efficiency in managing information.