The usual explanation is to picture Bitcoin as a Supercomputer cluster. Just search the term "supercomputer cluster" and you will find out that if you connect one desktop computer to another in a single network you will be able to create a very cheap supercomputer which is also called a cluster computer.
i generally don't like your comparison because it is not a good one in my opinion!
The miners are actually machines that verifies transactions.
wrong. miners find blocks they do not verify transactions. nodes verify them. then a miner includes those verified transactions in the block they found.
They are called miners since they are earning rewards from 25 Bitcoins when it started
it started from 50