Social media refers to computer-based technologies that facilitate sharing ideas through virtual networks and communities on the internet. It is commonly used in business for purposes like marketing products, promoting brands, and connecting with customers new and old. Popular social media sites include Facebook, YouTube, Twitter, and LinkedIn, with Facebook having the most users globally. Social media gives people a way to feel involved in world events and raise awareness of issues. However, there are also risks like cyberbullying and privacy concerns to be aware of.