EatTheBlocks Forum

Polygon (Matic) sidechain. What is it for? layer 2?

Hi everybody,
I am still not clear about Polygon blockchain. I read that it can be used as Layer 2 scale up for Ethereum.
I read that we can deploy our smart contracts to Polygon instead directly to Ethereum. But what is good about it? How do our smart contracts move ETH or other ERC20 tokens on the Ethereum if the smart contracts themselves are on the Polygon?

Can anybody explain in easy-to-understand way?