Can someone explain what is a blockchain?

Hello all,

Like a lot of people I have heard talking a lot about cryptocurrencies in the last years (bitcoin, litecoin, dogecoin on reddit, now ethereum and steem) but I have troubles to understand easily what a blockchain is?
So it would be great if someone could help and explain with simple worlds or point to a good resource explaining that :)
Thank you in advance,
Ellakee

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