Why should you use Facebook pixel?
If you want to advertise on Facebook and you want to know how many people took action on your website after seeing your ads you need Facebook pixel installed on your website.
You also need it, if you would like to show Facebook ads to your website visitors. It means whoever visits your website will see your Facebook advertisement when they go to Facebook.
If you are able to add code to your website, you will be able to add the facebook pixel with the help of this article: https://www.facebook.com/business/learn/facebook-ads-pixel
If you need help, please contact me.