Final answer:
The key difference between Web Design 1.0 and Web Design 2.0 is the level of user participation and interactivity.
Step-by-step explanation:
The key difference between Web Design 1.0 and Web Design 2.0 is the level of user participation and interactivity. In Web 1.0, websites were primarily static and users could only passively view content. In contrast, Web 2.0 introduced a more participatory web where users could actively engage with websites through social media, posting videos, and e-commerce activities. This shift in web design allowed for greater user involvement and contributed to the rise of user-generated content and online commerce.