What is the Blockchain ?
The Blockchain is easy to explain:
You have to imagine that every transaction that is documented will be stored on every computer in the world. Imagine a 3-fold table. With User A, User B and Transmitted Amount. In the first column is the User A to User B what has been transferred and in the 2nd column is the User B what has received from User A. The 3rd column shows the total amount in BTC. So this transaction is of course not on a computer but on each individual computer that is connected to the blockchain.
Example:
In the case of this example, there are 10 BTCs that have been transferred. This information is therefore on 17 computers (of course they are on every computer in the world). Each transaction info has its memory. At some point, of course, this memory is full.
Ex: We take a square USB cube with example 1 MB. So you save each transaction on this USB cube. At some point the USB is full. So we have a block full. We jump to the second block and then to the third block.
Currently we are at block 503'444, every 8.03 minutes a new block is generated.
Since all computers are now connected, therefore, the term "block chain". And that's why the blockchain is UNHACKABLE or would you like to hack all Bitcoin machines as a hacker because that would be necessary to forge something in the data. Because at the top of our picture there is only one file wrong that notes the blockchain and does not transfer. If you had to hack all 17 then it would work.
I hope it helped you Newbies.