问候卡是人们在遇到特定的日期或事件的时候互相表示问候的一种卡片，用于喜庆的又称贺卡。

人们通常赠送贺卡的日子包括生日、圣诞、元旦、新春、母亲节、父亲节、情人节等日子。贺卡上一般有一些祝福的话语。另外也有探病卡、感谢卡等种类。

中文贺卡格式：

收信人名称（必须加上「：」）
祝XXX（祝福语，例如生日快乐、圣诞快乐等）
XXXX（祝福语，例如生日快乐、圣诞快乐等）
　　收信人对写此贺卡的人的称谓（置右）
写此贺卡的人的名称（置右）
日期（置右）

A greeting card is an illustrated piece of card or high quality paper featuring an expression of friendship or other sentiment. Although greeting cards are usually given on special occasions such as birthdays, Christmas or other holidays, they are also sent to convey thanks or express other feelings. Greeting cards, usually packaged with an envelope, come in a variety of styles. There are both mass-produced as well as handmade versions that are distributed by hundreds of companies large and small. While typically inexpensive, more elaborate cards with die-cuts or glued-on decorations may be more expensive.