LAYER 2s

Layer 2 (L2) crypto is a network or channel that sits on top of a Layer 1 (L1) network, like Bitcoin or Ethereum, to improve the speed and reduce the cost of transactions on a blockchain. L2 networks are secondary protocols that handle transactions off the main blockchain, thereby reducing congestion and fees on the original network. 

 Layer 2 is an umbrella term to describe solutions that build on top of Ethereum mainnet (layer 1) to improve the scalability of the Ethereum network.