Allah, (God) the one and Only God, the Creator, the King, and Owner of the universe, and only Lord who's worthy of worship and praise.

Translation to the above Arabic Qur'an verse:

Who is "Allah?"

"Allah" is the Arabic name that God gave himself. It translates to "the One and Only God."
He is the source of forgiveness, love, compassion, mercy, and peace.
On judgment day, Allah is the one who will hold each human being accountable for his/her deeds, actions, and words. He will grant paradise to the winning believers and hellfire to Satan and his followers.
He is the Creator, the Sustainor, the provider, the healer, the source of mercy, the source of compassion, the king and the owner of the universe. He was always present; and He will always be. He was never born, and he does not bear. He commands things to be; and they become. He is the light and guidance in the skies, heavens, and on earth.
He created angles, jins, humans, and things to worship and praise Him.
He does not need His creation, but they all need him.
His mercy and love supersedes his anger and wrath.
He promised paradise on judgement day as well as the good life to all those who worship him and follow in the path and footsteps of his prophets and messengers, living life within the guidelines prescribed in His holly books.
He sent prophets and messengers to help guide humanity on how to live this great, yet temporary, life and win in the eternal hereafter.
He's the one who inspires guidance to all believers and anyone who searches for guidance and direction.