Imagine you have a special kind of digital money called Bitcoin. Unlike regular money, it's completely online. There's no central bank or government controlling it. Instead, it works on a network of computers across the world. People use powerful computers to solve complex math problems, and this process, called mining, creates new Bitcoins. Every time someone sends or receives Bitcoins, the details are recorded in a public ledger called the blockchain. This ledger is like a huge, shared list that everyone can see, so it's nearly impossible to cheat or fake transactions.
Now, Bitcoin is just one type of cryptocurrency. Cryptocurrencies are like different brands of digital money. They all use blockchain technology, which is like a digital ledger that records all transactions. Because it's decentralized (meaning no single person or group has control), it's secure and anonymous. People can buy, sell, or trade these cryptocurrencies online, and their value can change just like stocks in the stock market.
In short, Bitcoin is a type of digital currency that operates independently of a central authority, using a technology called blockchain to secure and record transactions. Cryptocurrency is a broader term that includes Bitcoin and many other similar digital currencies.
...at least, this is what Chat GPT told me.