Respuesta :

It is called relevant.
Relevant is just a synonym to related, so if it's not related to the subject than it would be irrelevant. 

Answer: Relevant.

Explanation: The description given matches the Cambridge's dictionary definition of the word "Relevant". Something that is relevant is appropiate or connected to what is happening or what is being discussed. Something relevant is suitable for a particular purpose.

For example: Education is relevant to the children's future.

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