Is Uniswap a dex?

Excuse me, could you elaborate on whether Uniswap is indeed classified as a decentralized exchange, or dex, in the cryptocurrency landscape? I've heard about its popularity and liquidity but am unsure of its technical classification. Given its automated market maker model and the ability for users to swap tokens directly without a central authority, it seems to fit the bill. However, I'd appreciate a concise yet thorough explanation of why Uniswap is considered a dex and how it differs from traditional centralized exchanges. Thank you for your time and attention to this inquiry.