ZkSync is a layer 2 scaling solution for the Ethereum blockchain that aims to improve upon existing solutions by offering faster and cheaper transactions, as well as increased scalability.

One of the main advantages of zkSync is its use of zk-SNARKs, a form of zero-knowledge proof that allows for the validation of transactions without revealing any sensitive information about them. This allows for greater privacy and security on the blockchain, as well as the ability to process transactions more quickly and at a lower cost.

Another key feature of zkSync is its support for off-chain transactions, which allows for a much higher throughput than on-chain transactions. This means that more transactions can be processed per second, leading to faster confirmation times and reduced fees.

In addition, zkSync also implements a "Rollup" mechanism that enables to bundle multiple off-chain transactions into a single on-chain transaction, which further reduces the costs and increases the scalability of the system.

Another advantage of zkSync is its compatibility with existing Ethereum tools and infrastructure, making it easy for developers and users to integrate with their existing applications and wallets. This allows for a smooth transition to zkSync without the need to completely rebuild existing systems.

Overall, zkSync's combination of zk-SNARKs, off-chain transactions, and rollup mechanism make it a highly efficient and scalable solution for the Ethereum blockchain, with the potential to dramatically improve the user experience and lower the barriers to entry for new users.