who is allah ?

Allah is the proper name in Arabic for the English word God

in the Holy Quran who is allah ?

He is God, the One besides Whom there is no other god; Knower of the worlds insensible and sensible; He is the Most Merciful Provider, the Most Merciful Protector. He is God, the One besides Whom there is no other god; the Sovereign, the Most Holy, the Author of Peace, The Granter of Security, the Preserver of Safety, the Exalted in Might, the Irresistible Compeller, the Justly Proud. Glory be to God above the partners they attribute to Him. He is God, the Creator, the Originator, the Fashioner. To Him belong the most beautiful names. Whatever is in the heavens and on the earth does glorify Him; He is the Exalted in Might, the Most Wise. (Qur’an 59:22-2)