The idea of a blockchain itself is not that interesting of a concept. It's basically just a big list of data that can be added to, but can't be edited. The interesting part is how things get added. Specifically how can we trust that something getting added is correct. That's where proof-of-work/stake comes in. So in environments where you can't trust the other members of a network, proof-of-work is an attempt to mitigate the lack of trust. Instead of having a password or permissions to add items to the list, you have a method that shows a person didn't just make something up, like mining in Bitcoin.
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The idea of a blockchain itself is not that interesting of a concept. It's basically just a big list of data that can be added to, but can't be edited. The interesting part is how things get added. Specifically how can we trust that something getting added is correct. That's where proof-of-work/stake comes in. So in environments where you can't trust the other members of a network, proof-of-work is an attempt to mitigate the lack of trust. Instead of having a password or permissions to add items to the list, you have a method that shows a person didn't just make something up, like mining in Bitcoin.