Wikipedia: “A Christmas card is a greeting card sent as part of the traditional celebration of Christmas in order to convey between people a range of sentiments related to Christmastide and the holiday season. Christmas cards are usually exchanged during the weeks preceding Christmas Day by many people (including some non-Christians) in Western society and in Asia. The traditional greeting reads “Wishing you a Merry Christmas and a Happy New Year“. 
The first commercially available card was commissioned by Sir Henry Cole and designed by John Callcott Horsley in London 1843. 

Heard that after 180 years of history, this year (2023) might be the last year people send Christmas cards by “snail mail”, since the postage is going to be very expensive in 2024, due to the decrease in letter correspondence and increase in costs.

Back in the 1980’s I designed and printed Christmas post cards and sent to family, friends and customers. Made by airbrush on paper (except one that is with ink) 

In 2011 I started designing digital season greeting cards, playing with Adobe Photoshop:

And Happy New Year cards:

Merry Christmas and Happy New Year!