DNS-over-TLS (DoT) is a security protocol that provides encryption and privacy for Domain Name System (DNS) queries and responses. It is a method for sending DNS traffic over a Transport Layer Security (TLS) encrypted connection.

The DNS is a critical part of the internet infrastructure that translates domain names (such as www.example.com) into IP addresses (such as 93.184.216.34) that computers can use to connect to web servers and other network services. However, traditional DNS queries are sent in plaintext, which means that they can be intercepted and read by anyone with access to the network traffic. This can be a serious privacy and security concern, as it can allow attackers to monitor or manipulate DNS queries and responses.

DNS-over-TLS provides a way to encrypt DNS queries and responses, making it more difficult for attackers to intercept or tamper with the data. When a client uses DoT, it establishes a TLS connection with a DNS resolver that supports DoT. The client then sends its DNS queries over the encrypted connection, and the resolver sends back the encrypted responses. The client can verify the authenticity of the resolver's TLS certificate to ensure that it is communicating with the correct resolver.

DoT is supported by many DNS resolvers and operating systems, and it can be used to enhance the privacy and security of DNS queries on any device or network that supports it. It is a useful technology for protecting against DNS eavesdropping and man-in-the-middle attacks.

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