Linguistics is the scientific study of language, but there are several common misconceptions about what linguistics entails. It is not purely a natural science or social science, but lies between the two. While linguists study languages, they do not need to know many languages themselves. Linguistics also examines more than just grammar, involving the study of sounds, words, meaning, and language use in society. Findings in linguistics also vary between languages and over time as viewpoints change. Linguistics encompasses both historical changes in language and synchronic study of current language features and systems.