Do I need a realtor on my team? If so, why?

[Craig Chapman]

Just want to start this off by saying if this question comes across as insulting that is definitely not my intent. I'm only asking this for informational purposes. No harm intended.

I've been doing a lot of research on properties for sale in my local area. Maybe looked at over 100 properties. Another investor mentioned to me that I need a realtor. But why? Why do I need to use a realtor? What can they do to benefit my search for investment properties?