A house elevation is a drawing that depicts any specific side of a house. The elevation is like looking at a house from the side, whereas the floor plans look down at a house without a roof. The house elevation is distorted - whereas you and I would see depth and perspective when looking at a house from the street, an elevation drawing is compressed into a single plane. This says that lines are straight up and down and side to side on paper. While Focusing on the front elevation, imagine a plane parallel to the house's front walls.
