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彼女は私の彼女です
She is my girlfriend.
A female romantic partner or girlfriend
彼女とデートに行きたい
I want to go on a date with my girlfriend.
Commonly used in casual conversation to refer to a girlfriend.
'彼女' specifically refers to a female partner. For a male partner, use '彼氏' (kareshi).
'彼女' is most commonly used in romantic contexts. Avoid using it to refer to female friends unless the context is very clear.
From 彼女 (kanojo), a compound of 彼 (kare, 'he') and 女 (jo, 'woman'), meaning 'his woman' or 'girlfriend'.
In modern usage, '彼女' is often used to refer to a girlfriend, but it can also be used to refer to a female friend in some contexts. In formal or written contexts, '恋人' (koibito) may be preferred.