The Node Of Blockchain : what is this?

A Node is program that connect to rest of blochain technology. It does send information back to forth, check the transation and store the information of blockchain. 


 The network of blockchain is consist of only nodes I.e Ethereum Or Bitcoin are the collection of the nodes of all people in the world run by any individual people. 


Node is very important to blockchain because in the absense of node we cannot access the information on the blockchain. 


API plays key role in interacting for people by sending request and receiving response. There are two categories of node I.e 1) Light nodes 2) Full nodes. 


Light node sync the block header and request from full nodes for many queries. But. full nodes keep the entire state of a blockchain . 


Light Nodes installing the node program, setting configuration variables, downloading block headers, and checking ports and health to ensure they're running properly.but full nodes need to download every block from 0 to latest from scratch, and manually replay every block and transaction ever submitted by anybody ever.


You have to manage all the nodes most nodes weren't designed with reliability in mind, certain queries can involve running through millions of blocks and transactions, and often time out or crash a node. 


Node provider are the access the information on a blockchain without having to run your own node. 


Source:web 3 university

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