All research databases have the ability to filter results (just like online shopping). It allows you to take your search results and tailor them in more specific ways.
Across the top you'll see the most commonly used filters in the main Galileo search - Full Text, Peer Reviewed, Date Range, and Type of Source.
All databases have the ability to filter your results. Here is a comparison of several:
The top one is Gale Literature. The one on the left is ProQuest One Literature. The one on the right is JSTOR.
No matter where your limiters appear, know that they're there to help you refine your searches!