A Rollup Smart Contract is a solution designed to improve scalability and transaction efficiency on blockchains. It works by processing multiple transactions off-chain and then consolidating them into a single batch that is recorded on the main chain. This reduces the load on the main blockchain and lowers transaction fees.There are two main types of rollups: Optimistic Rollups and Zero-Knowledge Rollups. Optimistic Rollups assume transactions are valid and conduct periodic fraud checks, while Zero-Knowledge Rollups use cryptographic proofs to ensure transactions are valid before being confirmed on the main chain.This approach enhances speed and cost-effectiveness, enabling more users to interact with applications without being hindered by high fees or slow processing times. Rollup Smart Contracts are critical in addressing blockchain congestion, making them a key component in the broader goal of achieving faster and more scalable decentralized systems.