Here a person-1 send some bitcoin to person-2 so mostly cryptocurrency doesn't have privet servers so they use the p2p network. p2p means pear to pear. how p2p work. p2p use lot's of computer connect together and make a network to solve some mathematical problems. after they solve mathematical problems then transaction complete. so we call them miners. if you have any high power computer then you can be a miner. miner take some fees to solve your transaction problem. we can say that all the process is mining process.
Witch cryptocurrency profitable to mini?
we always want to mine profitably Cryptocurrency. in my opinion, the most profitable Cryptocurrency to mine is Ethereum(ETH).if you have high power computer or graphics card then you should try to mine Ethereum.
if you want to check the Difficulty and much more about Ethereum mining then you can check it on here. most of the miner now mine Ethereum and leaving bitcoin.because of bitcoin's Difficulty is high and Ethereum Difficulty is not so high that's why they move to Ethereum mining.
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