- Web 2.0 refers to Internet services that allow users to collaborate and share information online in new ways, through social media, wikis, and other tools. It emphasizes user-generated content over static websites. - Mashups are websites or applications that combine content from multiple online sources into a single integrated experience, using public APIs or other methods to source external content. They allow users to customize and remix content in new ways. - The speaker got started in Web 2.0 by creating simple yet fun mashups in her spare time that combined data from different APIs. This helped her get over an initial intimidation with complex Web service standards and discover the simplicity of REST APIs.