ために states the purpose of an action. It requires a deliberate goal, which is what separates it from ように.
Also known astame niためにin order to japanesepurpose
A purpose or beneficiary: 〜ために (do B in order to / for the sake of A).
けんこうの ために、まいあさ はしっています。
I run every morning for my health.
Noun + の + ために, or a volitional verb (dictionary form) + ために, states a goal or beneficiary. The subject of both clauses is usually the same and the action is intentional.
In the textbooksMinna II, lesson 42
What something is used for: 〜のに 使います / 便利です / いります.
この はさみは はなを きるのに つかいます。
These scissors are used for cutting flowers.
Dictionary form + のに marks the use/purpose, paired with 使う, 便利だ, 役に立つ, 時間が かかる, etc. (Don't confuse with the contrastive のに in lesson 45.)
In the textbooksMinna II, lesson 42