役 is a role or use, and 立つ here expresses fulfilling that role.
役 is a role or use, and 立つ here expresses fulfilling that role.
What does 役に立つ mean?
To prove useful for someone or some purpose.
How do you read 役に立つ?
It is read やくにたつ, written yaku ni tatsu.
When would you use 役に立つ?
Use it with に to name the person, task or situation that benefits.
How is 役に立つ different from 便利?
便利 describes something as convenient; this says it actually helps in a particular situation.
How does 役に立つ change in a sentence?
The verb 立つ changes: 役に立ちます, 役に立った, and 役に立たない.