is a shortened form of the transitive verb 向（む）ける ‘to aim at’, and is considered to be a 造語（ぞうご） (neologism). This means a word that was created for a specific purpose, and may not necessarily be used for anything outside of that purpose. The purpose of 向（む）け
is to attach to other nouns, in order to express that something is ‘intended for (A)’, ‘aimed at (A)’, or ‘oriented toward (A)’.
may be seen followed by the 格助詞（かくじょし） (case marking particle) に
(when followed by a phrase), or the 格助詞（かくじょし） の, when linked with another noun.
This textbook is written oriented toward advanced people.
Why don't you study Japanese by reading books written for children?
If I were to buy 10 computers intended for office use, how much would that cost?
This movie is intended for adults so I can't show it to you.
In terms of products and similar items, although 向（む）け
highlights that something has been intended for (A), it doesn’t necessarily mean that it is limited to (A).
The place I am living is intended for one person, but even as a three person family, we can live there with no inconveniences.
, coming from the transitive verb 向（む）ける is used far more often to express that something has been specifically designed for (A). On the other hand, the suffix stemming from the intransitive verb 向（む）く, (向（む）き
), expresses something that faces toward (A), but perhaps not intentionally.
That toy is made for cats.
Books suitable for advanced learners are hard.