In order to travel outside the US and be able to come back, you have to file Form I-131, Application for Travel Document before leaving the US.
Advance parole allows you to travel back to the United States without applying for a visa.
Note:
Even with an Advance Parole document in hand, your Parole into the US is NOT guaranteed.
Read all the information on your Advance Parole Document carefully before leaving the US.
Contact me if you need help with Filing an application for Advance Parole
I’m not a lawyer and I don’t provide legal advice. The points of this post are for informational purposes only and are not meant to be legal advice.