Asking these questions are of no use. When a cryptocurrency is released, those running the crypto (the devs) will give information on everything about the coin. Every alt coin has its own purpose and they are all working towards that particular purpose and nothing else. Litecoin has its purpose why it was released in the crypto world and that is to be a faster means of making transaction, a method that should be faster than Bitcoin. Then Ethereum is the smart contract… And they all continues. So if you want to know the purpose for which any altcoins was created, then you should go and read about them.