There are different types of the column based on the samples to be separated. Column are considered as the heart of the chromatograph. There is stationary phase in the column which is used for the separation of the sample. The packing material in the column have smaller size. Now the polar parts of the samples can be separated very quickly if the mobile phase is polar and the non polar part of the sample takes time to separate. So based on the adsorption the sample are separated by the column. And vice-versa if the mobile phase is non-polar.