A compressive test is a method used to determine the behavior of materials under compression. In this test, a sample material, such as concrete or metal, is subjected to a controlled compressive force until it deforms or fails. The results help engineers understand the material's strength, ductility, and overall performance in structural applications. During the compressive test, the material is placed in a testing machine, which applies pressure gradually. The force and the resulting deformation are recorded, allowing for the calculation of important properties like the compressive strength. This information is crucial for designing safe and effective structures, such as buildings and bridges.