Neck support pillows

Deanna • Im a FTM to a baby girl born April 29 (after being told i could not have children) i plan to stay at home with her :) and im pro breastfeeding!
I honestly dont know anything about them...do you HAVE to have one for your infant car seat? If so what kind...? Please help i have like a tiny boppy pillow but when i googled them it didnt apear to be the same thing