de qué sirve

what's the use of

→ de
phrase Rare #34,844
what's the use of Used to ask about the purpose or usefulness of something, often followed by an infinitive. It can also mean “what good is it?” depending on context.
SP: ¿De qué sirve quejarse si nadie va a escucharnos?
EN: What's the use of complaining if no one is going to listen to us?

De qué sirve ir?

What's the point of going?

— El conformista (1971)

Sonríe, ¿de qué sirve llorar?

Smile, what's the point of crying?

— Pillion (2025)

No tenemos comida, ¿de qué sirve leer un libro?

We have no food, what's the point of reading a book?

— Acantilado rojo (2008)

Y ¿de qué sirve?

And what good is it?

— La cinta blanca (2009)

De qué sirve?

What’s the point?

— Mi amigo Ivan Lapshin (1985)

Y de qué sirve?

And what good is it?

— Indiana Jones y la última cruzada (1989)