Facebook and Facebook Lite represent the face of the social media site.
The regular version has more graphics and more features while Facebook Lite focuses on working better on lower end phones with less data.
If you like Facebook but hate the official app, we recommend trying the Lite version to see if it works better for you.
It comes with all of the features, including the legendary chat heads functionality.
Finally, Facebook Kids is Facebook's service specifically for minors with heavy parental supervision and oversight.
Facebook Pages Manager is, well, an app for managing pages on Facebook.