A hiss is a sharp, sibilant sound often produced by forcing air through a narrow opening. It is commonly associated with certain animals, such as snakes, which use this sound as a warning. Hissing can also occur in various mechanical contexts, like when steam escapes from a valve or when air leaks from a tire. In human communication, a hiss can be used to express disapproval or to get someone's attention. The sound is characterized by a high frequency and can vary in intensity. Hissing is also a common feature in certain languages, where it may be used to convey specific meanings or emotions.