When was Uniswap V3 deployed?

Can you tell me when exactly Uniswap V3 was deployed? I'm interested in understanding the timeline of this major upgrade and how it has impacted the cryptocurrency market. Additionally, what were some of the key features and improvements introduced in Uniswap V3 that made it stand out from its previous versions? I'm hoping to gain a deeper insight into this development and its potential implications for the future of decentralized finance.