Looking up...
彼女は優しい女性です。
She is a kind woman.
An adult human female.
この会社には多くの女性社員がいます。
This company has many female employees.
Refers to adult human females in general contexts.
In contexts where gender neutrality is preferred, '人' (person) or '方' (person) may be used instead of specifying '女性' or '男性'.
'女性' is the formal and polite term, while '女' is more casual and can be seen as less respectful in some contexts.
From 女 (woman) + 性 (gender/sex).
In modern Japanese, '女性' is the standard term for 'woman' in both formal and informal contexts. '女' is more colloquial and can sometimes be perceived as less polite.