Rate reminders ask the user to rate the app on the platform specific store.
You can currently only configure the rate reminder based on the amount of times the user has opened the app. The popup is shown on app launch when the required amount of app openings has been met.
On iOS this is done by showing Apple's build in rating popup.
"You should be aware that the prompt will only be displayed to a user a maximum of three times within a 365-day period." - Apple docs
You can find examples on how to implement Rate Reminder for the following platforms: