Web 2.0 refers to websites and platforms that allow user-generated content and social interaction. Popular examples include YouTube, Wikipedia, and Flickr. Social media enables users to share and interact through uploading content on platforms like Facebook, YouTube, and Twitter. User-generated content is published by users and can include anything from videos to blog posts. Social media can be used by businesses and organizations to promote themselves and share information through creating pages and profiles. Engineering professionals can also use social media to collaborate and share ideas and innovations with other experts in their field.