A spam folder is a specialized email inbox that stores messages identified as potential spam by an email provider's filters. The term refers to unsolicited bulk emails or commercial messages sent indiscriminately to large numbers of recipients, often with the aim of selling products or services. Spam folders are used by email providers to keep unwanted messages out of users’ primary inboxes while still allowing them to access and review any legitimate communications that may have been mistakenly flagged as spam.