4. What is Blockchain technology? A) A video game B) A digital ledger C) A type of cryptocurrency D) A new internet protocol

The correct answer is B) A digital ledger.<br /><br />Blockchain technology is a decentralized, distributed ledger that records transactions on multiple computers. It allows for the creation of a secure, transparent, and tamper-proof record of data without the need for a central authority or intermediary. This technology is commonly associated with cryptocurrencies, but it has a wide range of applications beyond digital currencies, such as supply chain management, voting systems, and identity verification.