Altcoin and Blockchain

[makishart]

I think some of these cryptocurrencies just derived its blockchain from the more famous coin, like matic deriving from eth, basically their own blockchain have their own innovation implemented making them stands out than the other.
but basically it's still the same I think and there is usually more innovation the newer the blockchain is like comparing matic and avalanche with eth.
regardless i think they could be categorized under the same blockchain that is smart contract blockchain.