In a nutshell...Blockchain is an open ledger, a chain of transactions that is transparent (yet anonymous). Each time a transaction is completed, a block is added to the chain by a node (computer) in the blockchain ecosystem. Tokens/Coins are many times considered the currency to be able to use the ecosystem, and many blockchains reward the nodes with coins (referred to as mining). Each chain is distributed in full across all of the nodes in the ecosystem so there is always concensus and accuracy, practically eliminating any fraud/manipuation/etc. Unless 51% of the nodes are compromised at the same time, the chains are always in agreement. Value is derived by the usage of the blockchain, plus coins are initially sold to investors to fund the development of the blockchain (like stock shares). Each blockchain is different (whereas Bitcoin requires mining, some blockchains issue all or partial coins immediately without mining).
Thanks for the detailed explanation.