When you send someone a picture on the internet it's a copy, so you will both have the picture. But when you send someone things on a blockchain, it's not a copy. It's like passing real things like a teddy bear - you won't have it anymore after sending it. But it's also like money, so you can buy new things with it... well, actually not today, because not many people use blockchains, yet. But when you're grown up blockchains will be everywhere and you can buy almost anything with them.
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When you send someone a picture on the internet it's a copy, so you will both have the picture. But when you send someone things on a blockchain, it's not a copy. It's like passing real things like a teddy bear - you won't have it anymore after sending it. But it's also like money, so you can buy new things with it... well, actually not today, because not many people use blockchains, yet. But when you're grown up blockchains will be everywhere and you can buy almost anything with them.