When you wave to someone, that can also mean "hello." People started writing about 5,000 years ago. Language is a way for people to communicate. Soon, they will learn to speak. Writing came later. Some languages borrow words. We first called these devices "cellular phones." They can understand language. Yet they have an amazing ability. We first called these devices "cellular phones." People who can not hear use sign language. Language led humans to live in groups. They blur together. With language, people could connect with one another. Babies can not speak when they are born.