Twitter is a social media platform that allows users to post short messages called tweets. Key aspects of Twitter include: - Tweets are limited to 140 characters - Users can follow other accounts to see their tweets - Mentions using @username allow public replies and conversations - Hashtags like #fireworks allow users to find tweets on specific topics - Direct messages allow private conversations between followers - Strategic use of tweets can help promote businesses and drive traffic to websites - Engaging with other users through sharing, retweeting, and starting discussions helps build connections and communities on Twitter.