Blockchain technology can be a confusing concept to understand.Luckily, we are here to simplify things. Blockchain technology is a relatively new concept and rapidly growing industry. Similar data structures have existed long before the popular bitcoin cryptocurrency was conceived, however, principal theories of blockchain architectures used today were first outlined and defined in the original bitcoin white paper written and published by Satoshi Nakamoto in 2008.
A distributed ledger is a consensus of replicated, shared, and synchronized digital data geographically spread across multiple sites, countries, and/or institutions.
A blockchain is a type of distributed ledger, comprised of unchangable, digitally recorded data in packages called blocks.
A blockchain is just one type of distributed ledger, not all distributed ledgers necessarily employ blocks or chain transactions.