ZK Rollups and Optimistic Rollups are both Layer 2 scaling solutions for blockchain networks. ZK Rollups use zero-knowledge proofs for faster, more efficient transactions, offering higher security and lower latency. Optimistic Rollups, on the other hand, assume transactions are valid but allow for fraud proofs. ZK Rollups are ideal for high-throughput, secure applications, while Optimistic Rollups offer simpler, cost-effective scaling. Choose based on your project's needs for speed, security, and cost efficiency.