Digital data copies perfectly, which means digital money faces one hard question: what stops the same unit being spent twice? Before blockchains, the answer was always a central party keeping the single authoritative record.
A blockchain answers it without that party. Transactions are ordered by consensus, and once one spends a unit, any later attempt to spend the same unit is rejected by everyone. This is what all the machinery is for - the blocks, the confirmations, the fees. Not complexity for its own sake, but the cost of settling that one question with nobody in charge.
Binance Academy covers this in more depth: https://www.binance.com/en/academy/glossary/double-spending
Trading crypto from Dubai since 2019.
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