This is the 6052nd most frequent Turkish word.
yarar
Benefit; usefulness.
In this sentence, 'yarar' is used as a noun meaning 'benefit' or 'advantage'.
Bu kitap öğrencilere büyük yarar sağlar.
This book provides great benefits to students.
Here, 'yararlı' is an adjective form derived from 'yarar', meaning 'helpful' or 'beneficial'.
Sabırlı olmak her zaman yararlıdır.
Being patient is always helpful.
In this case, 'yarar' functions as a verb meaning 'to benefit' or 'to be useful' when combined with the auxiliary verb 'mı'.