End-to-end encryption (E2EE) is a communication system with which the people who are communicating only can read the messages. Nobody else can access the messages, including the company that runs the service.
In general, all the server based communication system doesn't provide E2EE but it protects the communication between Client & Server.
Recently (after March 31, 2016) WhatsApp introduced this service for text & voice messaging services.
By using E2EE method, data is transferred securely between end points by using the security key, which cannot be decrypted even by the server.
Implementation details of E2EE in WhatsApp
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