4. What is blockchain technology?

Blockchain technology is like a digital ledger, or a secure online notebook, where information is stored in a chain of blocks. Each block contains data, and once it's full, a new block is added. What makes it special is that once data is written in a block, it can't be easily changed, making it very secure. It's like a shared book that many people can see and add information to, but no one can tear out pages or change what's already written. This technology is used for things like cryptocurrencies, but it also has many other uses, like making sure records and transactions are safe and trustworthy.