Can you explain double-spending in the context of a blockchain?

"Although blockchain networks related to Cryptocurrencies are inherently secure due to their distributed nature and verification of the transactions, there are some flaws that bad actors can use to take advantage of the system. Double-spending is one of these flaws. It involves using the same digital tokens or coins multiple times. Even though the same coins can be used repeatedly, the transactions need to be verified and recorded each time they are used. If they're not, the value represented by the corn may not be valid, and the recipient may not be able to reuse it for future transactions."