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Chatting is the most popular way to communicate and get things done today. The number of people using WhatsApp, the world’s most popular messaging app, is close to 1.5 billion. Chat architecture in a nutshell consists of two parts: Chat App and Chat Server Engine. Chat App acts as a mediator between the user and the backend, and delivers messages to the recipient. Chat Workers are handled by Chat Workers, which take messages from the server and deliver them to the recipients at the moment.