It provides information about Geotechnical properties of soil and furnishes data about resistance of the soils to penetration which can be used to evaluate standard strength data, such as N value of the soil.
N = number of blows per 30 cm of penetration using standard split spoon.
it is a procedure to obtain undisturbed samples at varying depths so that we can find cohesion, C and angle of internal friction, which are used to find the bearing capacity of soils.