Geotechnical soil testing is essential for evaluating soil properties to ensure safe and stable construction. It includes field and laboratory tests to assess soil strength, compaction, water content, and permeability. Common tests include sieve analysis for particle size, Atterberg limits for plasticity, moisture content measurement, Proctor tests for optimal compaction, and CBR tests for load capacity. These evaluations guide foundation design, slope stability, drainage planning, and overall site suitability.​