additionally, blockchain is a super cool latest technology which is also used by bitcoin because of its high security . it uses high computing machine to store and process data , the main idea of block chain is no central server is needed for example if you take an email application that uses server , the way it works is first it will send the message from the sender to the server and then from the server it will send the message to the reciever as you can guess it is two way process but is we replace this application with blockchain we donot need a central server or database here is how it works all users will be registered as a block and they will hold encrypt and decrypt information to perform either symetric or asymetric encryption , when users send message it will also send the decryption key to the reciever so only the target reciever can see the message and the reciever directly recieves the message (one way communicatio so it is very fast)