Roman's
used three types of columns through out their long history.
The fist
and most basic type was called the Doric Style. It's plain features
where not as attractive as its futures forms but it served a
great purpose: to hold up huge and heavy buildings.
The Ionic
Style, with its more decorative base and top, was the next type
to be used. It still had the same purpose as the Doric style
but it futher increased the awe power of the building
it was used with.
The Cornithian
type was the King of all Columns. It's fine details and size
made the other two types look like twigs.
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here some comparason pictures