This document discusses invitations and provides examples of invitation texts for various events. It begins by defining an invitation and explaining that invitation cards are typically used to invite people to events like birthday parties, weddings, and other occasions. It then provides details that are commonly included in invitation letters like the title of the event, names of invitees, date, time, sender. The document also discusses the differences between formal and informal invitations and provides examples of wording used for each. It includes sample invitation texts for a birthday party, new year's party, meeting, and discusses different types of invitations like dinner, anniversary, wedding, birthday, reunion, and Halloween invitations.