OTR stands for "Off-The-Record" and it is a cryptographic protocol that provides secure communication for messaging applications. OTR is designed to allow users to have private conversations over the Internet by providing encryption for the messages that are sent between users. It is designed to be used in situations where the parties involved do not want the contents of their conversations to be made public or to be logged by third parties, such as internet service providers or governments. OTR provides a number of security features, including authentication of the parties involved in the conversation, encryption of the messages, and protection against replay attacks.

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The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries of its existence. Nikola Tesla