A mirror site, also known as a mirror server or mirror, is a duplicate website that contains identical content to another website. It serves as a backup or alternative location for users to access the same information, files, or services. Mirror sites are often used to alleviate heavy traffic on a main website or to provide access to the same content in different geographical locations. They are also commonly used for disaster recovery purposes, ensuring that important information remains accessible in case of a server failure. Mirror sites are typically updated regularly to maintain the same content as the original site.