It is a known fact that every language has one or more terms that are used to refer to God and sometimes to lesser deities at the same time. This is not the case with Allah. Allah is the personal name of the One true God. Nothing else can be called Allah. The term has no plural or gender. This shows its uniqueness when compared with the word "god," which can be made plural, as in "gods," or made feminine, as in "goddess." It is interesting to note that Alah is the personal name of God in Aramaic, the language of Jesus and a sister language of Arabic.
The One true God is a reflection of the unique concept that Islam associates with Allah. To a Muslim, Allah is the Almighty Creator and Sustainer of the universe, Who is similar to nothing, and nothing is comparable to Him.

The Prophet Muhammad was asked by his contemporaries about Allah; the answer came directly from Allah Himself in the form of a short chapter of the Quran, which is considered to be the essence of the unity or the motto of monotheism. This is chapter 112, which reads:

"In the name of Allah, the Merciful, the Compassionate."
"Say (O Muhammad), He is Allah, the One God, the Self-Sufficient, who has not begotten, nor has been begotten, and equal to Him is not anyone."

Some non-Muslims allege that God in Islam is a stern and cruel God who demands to be obeyed fully and is, consequently, not loving and kind. Nothing could be farther from the truth than this allegation. It is enough to know that, with the exception of one, each of the 114 chapters of the Quran begins with the verse, "In the name of God, the Merciful; the Compassionate." In one of the sayings of Prophet Muhammad, may the mercy and blessings of God be upon him, we are told that:

"God is more loving and kind than a mother to her dear child."

On the other hand, God is also Just. Hence, evildoers and sinners must have their share of punishment, and the virtuous must have God’s bounties and favors.