This document provides an overview of the evolution of the web from Web 1.0 to Web 2.0. Web 1.0 consisted of flat, read-only pages with no user contribution, while Web 2.0 enables interactive information sharing, user-generated content, interoperability, and collaboration through features like social networks, crowdsourced content, location services, multimedia sharing, microblogging, and open APIs. It discusses how governments can leverage open data and services through initiatives like Gov 2.0 to engage users and enable innovation. The key aspects of Web 2.0 that make information more useful and valuable are enabling user contribution and interaction, opening and sharing of data, and connecting people.