A Block, in its simplest form, is a collection of digital data.
Blockchain transactions are grouped into blocks.
Think of a block as a folder on your computer that contains a bunch of files that can be opened and viewed by anyone, at any time.
The files themselves are the individual transactions that occur over some interval of time on the blockchain.
Each file contains the who, what, when, where, and why of the current transactions, as well as information about the block previous to the current one.
That’s where the term blockchain comes from.
Each block is linked to the previous block so that transactional data can be confirmed as accurate and not tampered with.
Technically speaking, blocks contain transaction timestamps and checks to make sure digital asset balances aren’t spent more than once and that digital signatures match public keys of the message.
This recorded data is permanent and public.
Blocks are added to the blockchain by validators or miners, who are given a chance to verify and confirm network transactions using various methods depending on their networks’ consensus mechanism.
If they are chosen, validators and miners receive a reward for their work.