zkSync is a scaling solution for Ethereum that uses zk-Rollups, a type of zero-knowledge proof technology, to improve the network's efficiency, scalability, and transaction speed. Here's a comprehensive overview:

**Understanding zkSync and zk-Rollups:**

**1. What is zkSync?**
zkSync is a layer-2 scaling solution for Ethereum, designed to increase transaction throughput and reduce fees while maintaining the security and decentralization of the Ethereum mainnet. It achieves this by leveraging zk-Rollups.

**2. What are zk-Rollups?**
zk-Rollups, or zero-knowledge rollups, are a layer-2 scaling technology that batches multiple transactions off-chain and generates a cryptographic proof (known as a SNARK) to verify the validity of these transactions. This proof is then submitted to the Ethereum mainnet, where it can be quickly and efficiently verified.

**3. How zkSync Works:**
- **Batching Transactions:** zkSync aggregates multiple transactions into a single batch off-chain.