Your Facebook profile is the personal area of Facebook. Everyone who has a Facebook account has a Facebook profile.
Why should we optimize our Facebook profiles? Because this helps us to get more traffic to our Facebook business pages. Think about this, when you post inside a Facebook group answering questions and helping other people in your niche, you post as your Facebook personal profile. When other people in your niche, click on your profile, you want them to see your Facebook business page, website, and other places where they can find you on the world wide web.