Is Gnosis Chain a sidechain?

Could you clarify for me if Gnosis Chain is indeed a sidechain? I've heard some people discussing it in that context, but I'm not entirely sure if it fits the definition of a sidechain, which typically refers to a blockchain that operates alongside and interacts with a main blockchain. Gnosis Chain, as I understand, is a layer-2 scaling solution that aims to improve the scalability and performance of Ethereum transactions. So, is it more accurate to consider Gnosis Chain as a layer-2 solution rather than a sidechain?