Bitcoin mining is the process by which transactions are verified on the blockchBlockchain "mining" i

Blockchain "mining" is a metaphor for the computational work that network nodes undertake to validate the information contained in blocks. So, in reality, miners are essentially getting paid for their work as auditors. They are doing the work of verifying the legitimacy of Bitcoin transactions and being rewarded for it. This convention is meant to keep Bitcoin users honest and to prevent the problem of "double-spending." 
Double spending is a scenario in which a Bitcoin owner spends the same bitcoin twice. With physical currency, this isn't an issue: When you hand someone a $20 bill to buy a bottle of vodka, you no longer have it, so there's no danger you could use that same $20 bill to buy lotto tickets next door. Counterfeit cash is possible, but it is not the same as spending the same dollar twice.Blockchain "mining" is a metaphor for the computational work that network nodes undertake to validate the information contained in blocks. So, in reality, miners are essentially getting paid for their work as auditors. They are doing the work of verifying the legitimacy of Bitcoin transactions and being rewarded for it. This convention is meant to keep Bitcoin users honest and to prevent the problem of "double-spending." 

• Double spending is a scenario in which a Bitcoin owner spends the same bitcoin twice. With physical currency, this isn't an issue: When you hand someone a $20 bill to buy a bottle of vodka, you no longer have it, so there's no danger you could use that same $20 bill to buy lotto tickets next door. Counterfeit cash is possible, but it is not the same as spending the same dollar twice.