A greeting card in a dream usually symbolizes a need for communication.
A dream that you give someone a greeting card can be a message that you need to communicate with that person about something.
You may have noticed something about them that is causing you to become concerned.
The type of card in your dream can give you an idea of what you should discuss with them.
For example, if you dream that you are sending them a birthday card, they may have gone through a big change in life, which has caused them to “grow” emotionally.
If you dream that someone else sends you a greeting card, your dreaming mind could be sending you a message about yourself.
For example, a dream that someone sends you a Thank You card could mean that you should be proud of your achievements.