How does bitcoin broadcast information?

How does bitcoin broadcast information?

On Bitcoin's Blockchain, how is information transmitted instantly to all other nodes and do nodes 'talk to each other' through an API?

Do Blockchain nodes communicate with each other through HTTP requests? If yes, do they use a Pub/Sub to transmit information to all the nodes? Or is there a delay until the full blockchain information reaches all nodes?

http://bit.ly/2AlTi0e

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