Social media is a collective term for online platforms that allow users to connect, communicate, and share content. Some prominent social media sites include Facebook, Twitter, Google+, Wikipedia, LinkedIn, Reddit, and Pinterest. There are various ways to market products on social media, such as establishing objectives, choosing relevant sites, maintaining a strong presence on Facebook and Twitter, utilizing LinkedIn for business connections, and creating engaging blog content or guest posts. Overall, social media provides a low-cost way for businesses to promote their brand and products to a wide online audience.