A "tweet" is a short message or post shared on the social media platform Twitter. Each tweet can contain up to 280 characters, allowing users to express thoughts, share news, or engage with others. Tweets can include text, images, videos, and links, making them versatile for communication. Users can interact with tweets by liking, retweeting, or replying, which helps spread information quickly. Tweets are often organized by hashtags, which are keywords preceded by the "#" symbol, allowing users to follow specific topics or trends. This feature makes tweets a popular tool for real-time updates and discussions.