You use this window to add new components to a project or to open existing ones. A view is the interactive map that you use to display, query, and analyze data in ArcView. A Theme is a file containing graphic information required to draw a set of geographic features together with information about those features. Themes are listed on the left side of the view window in the Table of Contents along with their legends that represent them on the map. Examples of themes are streets, buildings, cities, rivers, countries, railroads, etc.
Themes can cover geographic phenomena at any scale, from small gardens to the entire world.