The word "ditto" is commonly used to indicate that something previously mentioned is being repeated. It serves as a way to express agreement or to indicate that the same thing applies again without the need to restate it. For example, if someone says they enjoyed a movie, another person might respond "ditto" to mean they also enjoyed the movie.
The word "ditto" originates from the Italian word "detto," which means "said." It became used in English during the 17th century, often appearing in written lists or documentation to save time and space by indicating that something is to be repeated.