The document summarizes the three classical Greek architectural orders of Doric, Ionic, and Corinthian. It describes the key characteristics of each order including column style, capital design, and origins. The Doric order emerged in the 7th century BCE and was used for early Greek temples. The Ionic order originated in Ionia in the 6th century BCE and has distinctive voluted capitals. The most elaborate is the Corinthian order, with acanthus leaf capitals, that was influential in both Greek and Roman architecture. These orders have had a lasting influence on architecture for thousands of years.