Blockchain is a digital archive or registry, which can be private or public. It relies on a digital network of computers, or ‘nodes’ to verify details of the information, such as the authenticity of a transaction in the case of cryptos.
Many of us have heard of cryptocurrencies (like Bitcoin), which have exploded in value in the last ten years.
The underlying technology, blockchain, is the heart of crypto and many other new digital applications and ecosystems.
Weirdly enough, it is the same technology that powered torrent downloads in their heyday, about 18 years ago.