Greeting card companies create and sell cards designed to convey messages for various occasions, such as birthdays, holidays, and anniversaries. These companies often employ artists and writers to develop unique designs and heartfelt messages that resonate with customers. Popular brands include Hallmark, American Greetings, and Papyrus. In addition to traditional paper cards, many greeting card companies have expanded their offerings to include digital cards and customizable options. This allows customers to personalize their messages and share them through email or social media. The industry continues to evolve, adapting to changing consumer preferences and technology.