die Freundin
girlfriend
A female person with whom one has a romantic relationship.
Er hat seine Freundin letztes Jahr im Urlaub kennengelernt.
He met his girlfriend last year on vacation.

girlfriend / female friend
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girlfriend
A female person with whom one has a romantic relationship.
Er hat seine Freundin letztes Jahr im Urlaub kennengelernt.
He met his girlfriend last year on vacation.

To avoid misunderstandings, context is crucial. 'Meine Freundin' usually means one's romantic partner. To refer to a platonic female friend more clearly, it is safer to say 'eine Freundin von mir' (a female friend of mine).
Ich fahre mit meiner Freundin in den Urlaub.
I'm going on vacation with my girlfriend.
'Freundin' (girlfriend/female friend) is the feminine form of 'der Freund' (friend/boyfriend). The ending '-in' is used as standard in German to form the feminine form of terms for people.
Meine beste Freundin kenne ich schon seit dem Kindergarten.
I've known my best friend since kindergarten.
When the romantic partner is meant, 'Freundin' (girlfriend) is often used with verbs such as 'vorstellen' (to introduce), 'zusammen sein mit' (to be together with), or 'sich trennen von' (to break up with).
Er hat uns seine neue Freundin auf der Party vorgestellt.
He introduced us to his new girlfriend at the party.
When talking about a group of platonic female friends, you use the plural 'Freundinnen' (female friends). This often makes the non-romantic relationship clearer.
Sie trifft sich jedes Wochenende mit ihren Freundinnen.
She meets up with her female friends every weekend.
woman / wife
'die Frau' and 'die Freundin' can both refer to an important female person in someone's private life, but they are not the same. 'Meine Frau' normally means: my wife. 'Meine Freundin' can mean a female partner in a romantic relationship, but also a good female friend. That makes confusion easy. If you want to say clearly that someone is married, 'Frau' fits, or more precisely 'Ehefrau'. If you mean an unmarried partner or a friendship, 'Freundin' fits.

Meine Freundin hilft mir heute beim Umzug.
My girlfriend is helping me move today.
Nach der Arbeit ruft Mehmet seine Frau an.
After work, Mehmet calls his wife.