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The term is derived from the three consonants root w-h-d, which serves as the vehicle for the basic concept of �oneness,� or �unity,� along with the closely related ideas of �singularity� and �uniqueness.� These root letters are clearly apparent in the numerical adjective wahid [one]. In the words of the Qur`an:

{Your God is surely One}. 
[Quran 37: 4] inna Ilaaha-kum-la-Wahid

The term Tawheed demands a lengthier translation, namely: �the realization-and-affirmation-of-Oneness. The Unity of God, the Divine Unity, Unity in its most profound sense. Allah is The Real, The Absolute. Allah is One in His Essence, His Attributes and His Acts. Before the existence of the universe there was nothing but The Creator.

The Qur`an declares that {Nothing is like Him} [42:11]. Allah is omniscient and all-powerful. All of Allah�s attributes belong to Him exclusively. He is the first and there is no last but His oneness. He is the First without anything before Him. He is the Last without anything after Him. The end is with Him alone, and He is the End. He is All-Existing: with him there is no end. Allah is now as He was before. He is Eternal.

Tawheed can be viewed from the perspectives of:

Tawheed al-Rububiyah � Unity of  Lordship 

Tawheed al- Uluhiyah � Unity of Worship 

Tawheed al- Asma wa Sifaat � Unity of His Names and His Attributes 

Tawheed al Itabaa � Unity in the following the Prophet Muhammad, peace be upon him 

Tawheed undoubtedly is the central theme and message of the Qur`an, the Book of Allah and it is repeated in many other verses.

The Arabs in Mecca and later the Jews in Medina inquired from Allah�s Rasul (SAW), who is Allah? Allah revealed in Surah Ikhlas [Quran 112: 1-4] as follows:

In the name Of Allah, The most Gracious, The Most Merciful.

{Say, Allah is One, Allah The Everlasting, The Eternal, He has not given birth and was not born, And no one is comparable to Him}

In another verse, Surah (chapter) 24:35, an image of spiritual discernment of Allah is mentioned,

{Allah is the Light of the heavens and the earth���.. Light upon Light! And Allah guides to His Light whom He will}.

These verses confirm the Unitary belief, which is the mainspring of Islam and the core of The Qur`an.

Further, only in total acquiescence in Allah�s good pleasure, renunciation of one�s own will, and surrender to His will and guidance is Tawheed made perfect. Allah�s absolute unity is the beginning and the end of the spiritual life for Muslims.

The Unity of Allah is a magnificent and a beautiful concept, and Muslims reaffirm their adherence to it many times a day. To acknowledge the fact of the �affirmation-of-Oneness� renew your faith by frequent invocation of �La ilaha illa llah� [there is non worthy of worship accept Allah] will be the means to eradicate Shirk [polytheism].

It is a powerful and effective concept for focusing and organising one�s worldview and epitomising a religious and psychological orientation and authentically expressive of an important facet of the spirit of Islam.