What is the difference between Web 3.0 and Web3?

Could you elaborate on the distinction between Web 3.0 and Web3? Are they simply two variations of the same concept, or do they represent fundamentally different ideas within the realm of the internet's evolution? Is there a clear-cut definition that separates the two, or is the line blurred due to their overlapping features and goals? Additionally, how does this distinction impact the future of the internet and the world of cryptocurrency, especially considering the increasing prominence of decentralized systems and blockchain technology?