Is gnosis a side chain?

Could you clarify for me whether Gnosis operates as a side chain? I've heard different opinions on this matter and I'm trying to understand its architecture and functionality within the broader cryptocurrency ecosystem. Would Gnosis's operations be considered parallel to the main chain, or does it function in a different manner? I'm interested in knowing if it's designed to enhance scalability, security, or some other aspect of blockchain technology. Thank you for your help in clarifying this point for me.