In Google Analytics, the "Social" category refers to traffic and engagement from social media sites. This includes traffic from social networks like Facebook, Twitter, and LinkedIn, as well as social media sharing buttons on other websites that link back to your site.
The Social section of Google Analytics includes a range of reports that provide insight into your website's performance on social media. This includes information on the number of visits and engagement from social media, the most popular social networks, referral sources, and the impact of social media on conversions.
By understanding how your website performs on social media, you can identify opportunities to improve your social media strategy and drive more traffic and engagement from these channels.