The term output style (or just "style") is used to describe a particular method of documenting your work. Each style is designed as a complete solution for formatting and editing in-text citations, footnote citations, and bibliographies for all types of references.
You can think of styles as templates that show EndNote how to arrange the information in each of your EndNote references for citations and bibliographies. For example, a single reference could be formatted in the Chicago style like this:
Argus, Michele V., and Edward K.
Or it could be formatted in the Nature style like this:
Argus, M. V.
EndNote includes more than individual bibliographic styles. Only the most popular styles are stored as individual files in the Styles folder in your EndNote folder. (To add more, see Installing Additional Output Styles.)
The name of the style refers to the journal or publisher that has defined the bibliographic format. The Nature style, for example, is based on the format required by the journal Nature, and the Chicago style is named after the Chicago Manual of Style. Styles in the Export category, such as "RIS" are not bibliographic styles, but rather export styles designed to aid in transferring EndNote data into other databases.
To see the available styles in EndNote’s Styles folder, select Output Styles from the Edit menu, and select Open Style Manager. If your style is not available, you can download additional styles, any style can be modified to suit your needs, plus you can create new styles.
Styles can be downloaded or edited, and new styles can be customized, with EndNote's Style Manager.
The Style Manager allows you to find and preview installed styles. Commonly used styles can be marked as "favorites," which will appear in the Output Styles submenu of the Edit menu and in the list of available styles in Cite While You Write.