If I want to use SIM card for Verizon in foreign country, what kind do I buy?

I want to travel to another country. I have Verizon iPhone 7+ in America. What should I know when buying a SIM card in a foreign country to avoid international fees and roaming? Do I have to buy a CDMA SIM card? Will I get a new number? Will I have to download my apps again?

You need your phone unlocked.
You will get a number for that country.
Where are you going?
Research the options where you are going on the Internet.
Most countries are GSM only not CDMA.
Make sure your iPhone will do GSM.
A PAYG SIM will be your best option.