A tensile test is a laboratory procedure used to evaluate the strength and ductility of materials, in this case steel. During the test, a sample is subjected to a controlled pulling force until it stretches, deforms, and eventually breaks from the effects. The measurements are taken throughout the process to capture the changes in length of the sample as it undergoes the test. The results provide crucial data on the material's tensile strength, yield strength, elongation, and other mechanical properties, which help to determine its suitability for uses in construction, manufacturing, and engineering.