Definition
Blockchain is a digital record-keeping system that stores data in a series of linked units called blocks. Each block contains a group of verified records and a reference that connects it to the previous block, forming a continuous chain. This structure is maintained across many computers at the same time, making the shared record difficult to change once information is added.
In Simple Terms
Blockchain is a special kind of online database that keeps information in connected blocks. These blocks are chained together in order and shared across many computers. Because everyone shares the same chain of blocks, it becomes very hard for anyone to secretly change past information.
Context and Usage
The term blockchain is commonly used when discussing digital money systems, decentralized applications, and shared databases that do not rely on a single central operator. It appears in conversations about recording transfers of value, tracking digital ownership, and coordinating data among many participants who need a common, tamper-resistant record.