The humble greetings card actually has a fair bit of history with some if it's earliest roots in the 1500's, such as card exchanges for Valentine's Day. The invention of the printing press obviously made a valuable impact as many more could be printed in a much shorter space of time. Now it is standard to send a greetings card for most major holidays, especially Christmas.
However, mass produced cards may have taken a back seat to handmade cards. This is mainly for the reason of the extra care and thought that goes into making such an item. To help you we have range of full card kits, topper sets, blank card, envelopes and embellishments, to make card craft easy (with a little imagination, of course).