Languages are systems of communication used by people to express thoughts, ideas, and emotions. They can be spoken, written, or signed, and each language has its own set of rules, vocabulary, and grammar. There are thousands of languages worldwide, with Mandarin Chinese, Spanish, and English being among the most widely spoken. Languages can also reflect cultural identities and histories. They evolve over time, influenced by social changes, technology, and contact with other languages. Linguists study these changes and the relationships between languages, helping us understand how they shape human interaction and society.