Is Uniswap V2 same as V3?

Excuse me, I'm a bit confused about Uniswap's different versions. Could you please clarify if Uniswap V2 is exactly the same as V3, or are there some notable differences between the two? I'm trying to understand the key updates and improvements that V3 might offer over the previous version, and how they could potentially impact users and the overall DeFi ecosystem. Thank you for your help in clarifying this matter.