"They're" is a contraction of the words "they are." It is used in English to refer to a group of people or things. For example, you might say, "They're going to the park," which means "They are going to the park." This contraction helps make sentences shorter and more conversational. In writing, it's important to use "they're" correctly to avoid confusion. It is often mixed up with "their," which shows possession, and "there," which refers to a place. Understanding the difference between these words can improve clarity in communication, especially in contexts like school, work, or social media.