Allah means the one and only God who is worthy of worship. We believe God is one, indivisible, has no associates and has no partners. He is the First and the Last. He is the creator and owner of all things in the entire universe and He is the only One worthy of worship. There is nothing like Him.
The attributes of Allah are described in the Holy Quran, whereby Allah says:
“Allah – there is no deity except Him, the Ever-Living, the Sustainer of [all] existence. Neither drowsiness overtakes Him nor sleep. To Him belongs whatever is in the heavens and whatever is on the earth. Who is it that can intercede with Him except by His permission? He knows what is [presently] before them and what will be after them, and they encompass not a thing of His knowledge except for what He wills. His Kursi extends over the heavens and the earth, and their preservation tires Him not. And He is the Most High, the Most Great.” [Quran 2:255]
There is also other examples included Chapter 112 of the Holy Quran, whereby Allah says:
“Allah is He, than Whom there is no other god; Who knows (all things) both secret and open; He, Most Gracious, Most Merciful.”
“Allah is He, than Whom there is no other god; the Sovereign, the Holy One, the Source of Peace (and Perfection), the Guardian of Faith, the Preserver of Safety, the Exalted in Might, the Irresistible, the Supreme: Glory to Allah! (High is He) above the partners they attribute to Him.”
“He is Allah, the Creator, the Evolver, the Bestower of Forms (or Colours). To Him belong the Most Beautiful Names: whatever is in the heavens and on earth, doth declare His Praises and Glory; and He is the Exalted in Might, the Wise.”
[Quran 59: 22-24]