Fetching details from the dictionary...

popularity; public favor
condition (e.g. market); tone; character; nature
「人気」 has other readings with different meanings.
この店はとても人気があるよね。
This shop is very popular.
彼女は学校で人気者だったんだ。
She was popular at school.
人気のある商品はすぐ売り切れる。
Popular products sell out quickly.