What is bat (Basic Attention Token)?

Can you elaborate on the concept of Basic Attention Token (BAT)? I'm curious to understand its significance in the cryptocurrency and digital advertising landscape. Specifically, how does BAT aim to revolutionize the way content creators and advertisers interact? What is the role of the Brave browser in this ecosystem, and how does it contribute to BAT's value proposition? Additionally, what are some of the key features and benefits of using BAT for both publishers and advertisers? I'd appreciate a concise yet comprehensive overview of BAT's potential and how it stands out in the current market.