The Standard Penetration Test (SPT) is a widely used method for assessing soil properties during geotechnical investigations. It involves driving a split-barrel sampler into the ground at the bottom of a borehole using a hammer. The number of blows required to penetrate a specific depth indicates the soil's resistance and helps determine its density and strength. SPT results are expressed as the N-value, which is the number of blows needed to drive the sampler 12 inches. This data is crucial for engineers and geologists when designing foundations and other structures, as it provides insights into the soil's behavior under load and its suitability for construction.