OOTD stands for "outfit of the day." It's a term that's commonly used on fashion blogs and social media, especially Instagram. People often use the hashtag #OOTD to tag their outfit photos. The term can be used to describe both men's and women's fashion, but it's most commonly associated with women's style. An OOTD typically includes clothing, shoes, and accessories that are all coordinated together. It might be something you'd wear to work, on a date, or just out running errands. While some people use the term OOTD to simply mean "what I'm wearing today," others use it as an opportunity to show off their personal style and share fashion inspiration with others. If you're interested in fashion and enjoy seeing what other people are wearing, then following along with the OOTD hashtag is a great way to do that.