I think you might mean this... Every year a school, usually a high school, publishes a book that has pictures of all of the students. There are formal pictures that a professional takes, usually just a picture of the head. Then there are pictures of school activities, like sporting events, the music groups, the drama groups. Then there are just fun pictures of students being silly. Students usually order a book and then receive it toward the end of the school year. They sign messages in each others' yearbooks before they go away for summer, or , for the seniors, before they leave the high school for ever. Years later people go through their yearbooks and laugh at their goofy hair styles and remember all of the fun and not so fun times.

year·book (yir′bo̵ok′) noun - a book published yearly; A reference book that is published regularly once every year - a book giving statistics and data of the preceding year - a publication of the graduating class of a school or college, with pictures and reports of the school year just coming to an end .................. year·book (yîrˈbo͝okˌ) noun A documentary, memorial, or historical book published every year, containing information about the previous year. A usually bound publication compiled by the graduating class of a school or college, recording the year's events and typically containing photographs of students and faculty. ................... Note: The Yearbooks are the oldest English reports extant, beginning with the reign of Edward II., and ending with the reign of Henry VIII. They were published annually, and derive their name from that fact. They consist of eleven parts, or volumes, are written in Law French, and extend over nearly two hundred years. There are, however, several hiatuses, or chasms, in the series. --Kent. --Bouvier.

pictures of classmates and students from your school for the year?

Let the wikipedia speak http://en.m.wikipedia.org/wiki/Yearbook?wasRedirected=true