Definition of DNS cache
DNS cache is a temporary cache memory that DNS resolvers and other devices utilize to store information. The memory stores the DNS records that were first applied to the searched domain names. The IP addresses (IPv4 or IPv6) of domain names, information about their email server, their services, authentication and verification data, and more are all stored in these records. All of the data will be saved in the DNS cache. However, as previously stated, it will only be for a short time, as determined by the TTL (Time to Live) value issued to each DNS record.