Tag is when you attach one or more keywords to a post or page, you could add the name of your favorite band, place, activity, or action. You can also tag up to five people in a post, and they will receive the notification that they have been tagged to see the post. It is essential to learn between adding a tag and a hashtag. While tagging is used to include individuals in the post and gain a wider audience, hashtags are used to categorize posts using numbers of up to five words.