Cryptocurrency is a digital currency that is not linked to any country or government.
Instead, records of who owns what are held on computerised databases secured by strong cryptography using blockchain technology.
While cryptocurrencies can be used to buy day-to-day items in some stores, it is more commonly traded as digital assets as a way to profit from investment returns.
Impressive profits can be made buying and selling on cryptocurrency exchanges. But the prices can be very volatile so you could lose money too.
Some people have faced hefty losses when crypto has plummeted.