Tawhīd
Tawhid' is the concept of God in Islam which says that only One God exists. One and He has no equal. It also says that since the God is the only creator, there is no room for lesser Gods or deities. Any lesser gods are therefore false. Tawhid is an essential part of Islam. To become a Muslim it is necessary to accept it. The concept of Tawhid has many implications. Since God is the only power, both good and bad flow from God. So, whatever good or bad occurs to an individual, both are from God and both should be accepted by people.