Design a global chat service like Whatsapp or a facebook messenger.

1.	Design a global chat service like Whatsapp or a facebook messenger.
Answer» What are some of the required features? Allow users to chat over the internet. Provide support for one-on-one and group chats. Messages need to be stored for better viewing. Messages need to be encrypted for SECURITY purposes. What are some of the common problems that can be encountered? What would happen to a message if it is sent without an internet connection? Will encrypting and decrypting increase the latency? How are the messages sent and notified to the device? Possible Tips for CONSIDERATION: Split DATABASE schema into multiple tables such as user table, chat table, massage table etc. Make use of WEB sockets for bi-directional communication between the device and the server. Make use of push notifications for notifying the members even if they are ONLINE.

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