Compressive strength is a measure of how much force a material can withstand when being pushed or pulled together. It is an important property for construction materials like concrete and steel, as it helps engineers determine if a structure can support the weight it will bear. Higher compressive strength means the material can handle more pressure without breaking. In practical terms, when building a bridge or a skyscraper, engineers test the compressive strength of materials to ensure safety and durability. If a material has low compressive strength, it may crack or collapse under heavy loads, leading to potential failures in the structure.