A person's gender is the fact that they are male or female.

You can refer to all male people or all female people as a particular gender.

In grammar, the gender of a noun, pronoun, or adjective is whether it is masculine, feminine, or neuter. A word's gender can affect its form and behaviour. In English, only personal pronouns such as 'she', reflexive pronouns such as 'itself', and possessive determiners such as 'his' have gender.