Bitcoin mining is the process where bitcoin blocks are being solved and those blocks contains bitcoins.It is a way for a person to have a bitcoin but difficulty level goes high because of the competition between miners.

Another purpose of mining is for transaction confirmations, every time a bitcoin is transferred from one wallet to another confirmations are needed for the transaction to be verified and for it to go through, those transactions are also included on the blocks that miners are solving every time. We can say that mining is the heart of the block chain once mining stops bitcoin might die because transfers will be impossible.