In some network designs, tokens are used to operate the network rather than being a representation of an asset.
A protocol - has an input standard, format, or ruleset
A ledger - a collection of records or transactions.
Decentralized - not centrally located
Has Consensus - a form of agreement
Is Immutable - cannot be changed
Standardized data is how the Internet is accessible around the world, it's the globalized standard for sending and receiving information.
Websites are formatted based on Hyper-Text Transfer Protocol, we're able to write and read them anywhere in the world - as long as they use the same protocol!
With blockchain, that information can become an internet historical record.
Until now, there has never been a payment protocol for the internet because there was no decentralized way to record the transactions on the internet.
Each "block" is like a page in a book.
Once the "page" is full the block is closed and the system starts writing on the next block.
The closed block is stored in the blockchain forever as a historical record.
It's pretty much the internet for records.
This way you can't hack one centralized database to manipulate or change the data.
It's like you had a bunch of witnesses watch you transact money to a stranger, but instead these witnesses are computers or "validators".
Each transaction is digitally signed with encryption, or a hash.
In order to change the transaction you'd need to hack 51% of the network all at the same time to convince the validators it needed changed - good luck.