What are the two different types of pilasters?

The correct answer identifies the two types of pilasters as structural and ornamental, which reflects their primary functions in architecture.

Structural pilasters serve a practical purpose; they are integral to the building's load-bearing framework and provide support to walls or arches. These pilasters are usually constructed to withstand forces in a way that contributes to the overall stability of the structure.

Ornamental pilasters, on the other hand, are primarily decorative. They may mimic the appearance or design of structural pilasters but do not bear weight or offer support. Their function is to enhance the aesthetic appeal of a building's exterior or interior, contributing to stylistic elements without having a functional role in the structure's integrity.

While the other options listed present terms that may describe various attributes or classifications related to pilasters, they do not accurately categorize them in widely accepted architectural terms like structural and ornamental do. For example, textured and smooth refer more to surface finishes rather than types, internal and external describe locations rather than functional roles, and classic and modern pertain to stylistic eras rather than the pilaster’s structural significance.