There are a few reasons you might explore theses and dissertations:
- If you are embarking on writing your own thesis or dissertation, you may want to look at examples that others have written. (You could also ask your supervisor as they could probably recommend a few exemplars from your field of study.)
- While you might not necessary want to read an entire thesis or dissertation, if you can find one on the area you're interested in researching, you can scan their literature review/bibliography for resources.