This document provides an overview of the three classical Greek architectural orders - Doric, Ionic, and Corinthian. It describes the key characteristics of each order, including details of the columns, capitals, entablatures, and other elements. The Doric order is the heaviest and plainest, while the Ionic and Corinthian orders are more elegant with slender columns and ornate capitals featuring volutes and acanthus leaves respectively. Examples of each order from famous Greek temples are given. Important terms associated with Greek architecture are also defined.