Thanks for asking a question on www.thisisyourbible.com
The word "Gentile" describes anyone who is not Jewish. The phrase "Jews and Gentiles" could just as easily be stated, "Jews and non-Jews".
Here is a link to information on the website which will be of use to you:
Israel, God's People... www.thisisyourbible.com/library/show/158
I hope you have found this helpful.