Final answer:
The majority of church floor plans are based on the basilica design, which is characterized by a long central nave with aisles and often results in a cross-like layout, focusing on the altar.
Step-by-step explanation:
The majority of the floor plan of the church is made up of a basilica design. This type of church plan is characterized by a long central nave with aisles on either side and an apse at one end, often resulting in a layout that sketches the shape of a cross from a bird's eye view.
The cruciform shape was an innovation of Christian architecture to help manage the flow of pilgrim traffic in large pilgrimage churches and to symbolize the cross. Additionally, the design primarily focuses attention on the altar. While the central plan, which is based on a circle or a Greek cross with equal arms, also exists and emphasizes more equidistant measurements from a central point, the basilica remains the dominant plan.