Ethereum's Rollups help scale the network by processing transactions off-chain.  
They come in two types: Optimistic and ZK, each with trade-offs.  
Optimistic Rollups are cheaper but slower due to fraud proofs.  
ZK Rollups are faster and more secure but complex to build.  
Both reduce fees and congestion but rely on Ethereum for security.  
Adoption is growing as developers balance speed, cost, and ease of use.

Ethereum's Rollups are super cool, making things faster and cheaper while keeping everything secure and simple for devs to use