A concentration is an area of focus you can choose to study that relates to your college major. However, you should know that not all degree programs offer concentrations, and that concentrations can vary for the same degree, depending on the school you choose.  For example, Colorado State University offers a degree program in Agricultural Biology, with concentrations available in Entomology, Plant Pathology, or Weed Science. Another option at the school includes their History major option, with concentrations in General History, Language, Digital and Public History, Social and Behavioral Sciences, or Social Studies Teaching.