Non-binary is a term for people who are not men or women, or are both men and women, or who are something else entirely, or are some combination of these things, or some of these things some of the time. Nonbinary can be used both as an umbrella term and as an identity itself. Many other identities fall under the nonbinary umbrella, such as genderfluid, agender, etc. However, some people choose to identify solely with the label of nonbinary. There are many reasons for doing this, ranging from uncertainty to a dislike of labels.