What does hetero means
Difference in things...
The word “Hetero” means different or in other words it means attracted to the person of the opposite sex or gender. Like man and woman. It is taken from the Greek word “Heteros”
The word is also used in Chemistry as well for comparing an atom other than Carbon element so the word has many used in different places take for example.
But it mostly relates to heterosexuality the concept of it is really old but they say that idea and concept of it newly invented. During that time the idea of having desires for the opposite sex male and female was considered.
It is used in situations where we want to discuss something different or something that is off topic and it’s meaning.