The blockchain trilemma suggests that blockchain cannot achieve scalability, security, and decentralization simultaneously. However, the layer-2 scaling solutions have come to challenge the thought system. It allows the mainchain to take care of security while maintaining scalable networks in its additional layers.

Arbitrum serves as a Layer 2 cryptocurrency platform. By implication, the security and protection of the Arbitrum interface and network come from Ethereum itself. 

Ethereum plasma technology is a second-layer scaling solution for growth. The Plasma technology enables child chains to be designed to meet specific use cases; especially those not currently feasible on the Ethereum blockchain. All decentralized applications that require users to pay huge transaction fees are best suited for Ethereum Plasma.