The term "frontier" has several meanings, but generally refers to a boundary or region at the edge of something. In its historical context, it is often used to describe the American frontier - the vast and unsettled lands west of the original thirteen colonies in early America. The concept of the frontier was influential during that time period as people moved across the country seeking new opportunities and land. Today, the term can also refer to a cutting-edge or innovative field, such as the "digital frontier" which refers to the exploration and development of new technologies in computing and communication.