You will only need appendices in your paper if you have a lot of extra material that doesn't fit in the main body of the document. For instance, if you have conducted a survey, you might want to focus on certain data in the Results section of your paper.

When should an appendix be used?

Appendices are used when the incorporation of material in the body of the work would make it poorly structured or too long and detailed. The appendix may be used for helpful, supporting or essential material that would otherwise clutter, break up or be distracting to the text.

What is an appendix used for?

Normally, the appendix sits in the lower right abdomen. The function of the appendix is unknown. One theory is that the appendix acts as a storehouse for good bacteria, “rebooting” the digestive system after diarrheal illnesses. Other experts believe the appendix is just a useless remnant from our evolutionary past.