The RSVP card is a separate card that you can include for your guests to mail back to respond to your invitation.
In the case of a formal wedding with two separate venues for the ceremony and reception, you might opt to include a Reception Card with details on the location.
If you’re allowing space for someone to bring a guest, be sure to include “and guest” on the envelope, or preferably, include the guest’s actual name.
If you need to collect meal preferences, song selections for your reception playlist, or any other information from your guests, feel free to include those questions on your response cards.