A tongue, in the context of language, refers to a system of communication used by a specific group of people. It encompasses spoken, written, and signed forms, allowing individuals to express thoughts, emotions, and ideas. Each tongue has its own set of rules, vocabulary, and grammar, making it unique. Languages can be categorized into families, such as Indo-European or Sino-Tibetan, based on their historical and linguistic relationships. The study of tongues is known as linguistics, which explores how languages evolve, how they are structured, and how they are used in society.