Zk-rollups are a scaling solution for Ethereum that improves the network's efficiency by bundling multiple transactions into a single, compressed transaction called a "rollup." This reduces the amount of data that needs to be processed by the Ethereum network, allowing for faster and cheaper transactions.
The term "zk" refers to the use of zero-knowledge proofs, which allow the rollup to ensure the validity of the bundled transactions without revealing their contents. This improves privacy and security while still allowing for the benefits of batching transactions.
Here are 5 popular ZK-Rollup projects as of 2023:
Loopring (LRC)
Syscoin (SYS)
ImmutableX (IMX)
Hermez Network (Polygon zkEVM)
Polygon (MATIC)
(This is not a financial advice, Do Your Own Reasearch)