Tawhid means believing in Allah Alone as God and Lord and attributing to Him Aِlone all the attributes of Lordship and divinity. Tawhid is divided into three categories; namely, Tawhid al-Rububiyyah (Oneness of Divine Lordship), Tawhid al-Uluhiyyah (Oneness of Divinity) and Tawheed al-Asma wa’l-Sifat (Oneness of the Divine Names and Attributes). For more about the meaning of tawhid and its categories, see the detailed answer.