Mining definition can be broad…
On the Internet, mining usually refers to digital mining. In other words, using a cryptominer to mine coins – cryptocurrencies. This is done via some crypto miner app or by utilizing dedicated machines for this purpose.

How do you mine coins?
Digital mining means putting your computing power into solving difficult problems and getting crypto rewards for completing the task. The mining process itself takes longer and longer the more coins are mined, since the tasks themselves get more difficult.