This is the 2360th most frequent Russian word.
нужен
"Needed" or "necessary."
The word 'нужен' (needed) is connected here with the dative pronoun 'мне' (to me), expressing necessity.
Мне нужен инструмент для ремонта.
I need a tool for repairs.
Here, 'нужна' agrees in gender (feminine) with the noun 'помощь' (help).
Ей нужна помощь в учебе.
She needs help with her studies.
The plural form 'нужны' is used to agree with 'деньги' (money).