Most people know what a Bible is. Whether or not they read it is another question. But for those who want to know it and understand it better, a Study Bible is extremely helpful. What is a Study Bible?
A Study Bible is a Bible that's printed with a wide variety of tools and additional resources. Some have a specific purpose while others are complexity about making the Scripture more understandable through the additional information.
Here's a simple overview.
If you don't own a Study Bible, here's a video about how to pick a good Study Bible.