A pilaster is a shallow, rectangular architectural element that projects slightly from a wall, designed to resemble a flat column. While it often includes a base, shaft, and capital conforming to classical orders like Doric, Ionic, or Corinthian, it is primarily used for decorative purposes to break up empty wall surfaces or frame doorways and fireplaces. Although historically derived from the structural anta of Greek architecture, the pilaster evolved in Roman and Renaissance design into an ornamental feature that provides vertical rhythm and aesthetic sophistication without the bulk of a freestanding column. In modern construction, masonry pilasters may still serve a structural role by reinforcing wall stability, but they are most commonly employed as a stylistic device to add depth and classical character to both interior and exterior facades.