Study of sociology not only helps us to know our society and people but also the others, their role status, social structure, occupations, traditions, social norms, mores, culture, social institutions, religion and belief system and many more things beyond imagination. It helps at all levels to understand the structure and function of different organizations traditional to the modern. All organization are based on social social solidarity, so any organization be based on either mechanical or organic solidarity. So, to understand how does an organization functions in our day to day life it most necessary to under the concept of social solidarity, this is an example likewise there are several examples, which we can know by understanding the concepts as well as theories proposed in sociology.
I hope this helps