When we say ‘a group of computers,’ this can literally mean thousands of computers that require an internet connection to work. These computers are constantly solving complex equations to keep the Bitcoin network secure and to verify new transactions.
This process uses up a lot of electricity — not to mention PC hardware — as specialized pieces of equipment are needed to make sure the Bitcoin network is maintained. People who spend their time, money, and resources (like building expensive, powerful computers!) are called Bitcoin miners. Now, what do they get for network upkeep?