Despite what you might have heard, the perfect blockchain doesn't exist. To achieve that goal, a blockchain should be highly secure, decentralized, and be able to scale effectively, meaning it can quickly and cheaply process lot of transactions. 

The failure to offer all three features was dubbed the "blockchain trilemma" by Ethereum (CRYPTO: ETH) co-founder Vitalik Buterin, who was describing how there are always trade-offs when blockchains prioritize one feature over the others. Decentralization is inherent to blockchain structure, security is an essential property, yet scalability is typically the main challenge.

The trilemma is something Ethereum developers are keenly aware of, and they are doing everything they can to help the world's most valuable blockchain scale better. But sometimes a little help is welcome. 

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Source Fool.com