What is the difference between potentials & quotes?

What is the difference between potentials & quotes?

Hello,

Could somebody help me to understand what is the difference between potentials and quotes in Zoho CRM?

I know that there is an explanation in Zoho CRM on what potentials/quotes mean however I still don't understand how would this make a difference for my reporting if I'm using only potentials or a quote?

Does it make a difference if instead of quotes I use only potentials? 

I hope someone could have a simple explanation. Thank you in advance