SOCIOLINGUISTICS as you know is that branch of linguistics dealing with the influence of the society on language and vice-versa. Under this branch we deal with the problems faced in learning a language or, to say how a language is acquired and also how a language is modified according to different social circumstances. Through this we also come into contact with the traditional value of a language, which otherwise would have remained unknown to us. So, Sociolinguistics is an integral part in the study of language in common, and in the study of the impact of society over language. So, it is really important in the sphere of the study of language.
Language is the communication of thoughts and feelings through a system of subjective signals, such as voice sounds, gestures , or written symbols which is used by a nation, people, or other distinct community. On the other hand Society is a group of people related to each other through persistent relations, or a large social grouping sharing the same geographical or vital territory, subject to the same political authority and dominant cultural expectations. Sociolinguistics is an integral part in the study of language in common, and in the study of the impact of society over languag. So, it is really important in the sphere of the study of language.so sociolinguistics is the field of study having to do with the interaction of language and society—how all aspects of society have an effect on language, and how language has an effect on society