Demisexual or Polysexual: Understanding the spectrum

What does it mean to be demisexual or polysexual? For all those individuals who identify in this way, how are they different from those who identify within the better-known LGBT groups? The reality is that the LGBTQIA+ community is one of the most diverse groups worldwide and is made up of many smaller groups of people from non-traditional sexualities and gender identities. With such a diverse collection of groups and people, Why is it so important for many LGBTQIA+ individuals to create new terms or labels? Words and phrases and that ultimately best sum up or express their thoughts or feelings