Which emerging technology utilizes a decentralized, distributed, and immutable digital ledger to securely record transactions across a network of computers?

💡 Explanation:

Blockchain technology is defined by its use of a decentralized, distributed ledger that records transactions in a way that is immutable and transparent across a network. This ensures security and trust without the need for a central authority. Quantum Computing focuses on computation using quantum phenomena; Augmented Reality overlays digital information onto the real world; and Machine Learning is a subset of AI focused on systems learning from data.