LGBTQIA+ Pride: What does it mean to identify as nonbinary?

Since the 1990s, more people are becoming aware of and are identifying as non-binary, genderless, genderfluid or genderqueer. Over the past few years, more celebrities and well-known public figures have come out and stated that they do not exclusively identify as male or female. With more publicity and awareness, what does it mean to identify as non-binary, and how does a person’s gender identity relate to their sexuality?