According to Dvaita Vedanta, the existence of evil and suffering in the world is a result of the fundamental duality between Atman (individual self) and Brahman (universal self). In this philosophy, Atman is considered to be a distinct entity from Brahman, and the world is seen as a manifestation of Brahman's power. This duality is believed to be the cause of all dualities in the world, including good and evil, pleasure and pain, and happiness and suffering.

Dvaita Vedanta explains that the root cause of evil and suffering is the inherent nature of individual souls to be imperfect and limited. Due to this limitation, individuals are prone to making mistakes and acting in ways that may cause harm to themselves and others. This imperfection is a result of the individual soul's ignorance of its true nature as a part of Brahman.

Furthermore, Dvaita Vedanta states that Brahman is completely pure and perfect, and therefore, cannot be the cause of evil and suffering. However, Brahman's power and will are responsible for the manifestation of the world, including the dualities within it. This means that Brahman allows for the existence of evil and suffering in the world, but it is not the direct cause of it.

Moreover, Dvaita Vedanta emphasizes the concept of karma, which states that every action has consequences. The individual souls are responsible for their own actions, and the consequences of these actions may result in suffering. This is seen as a way for individuals to learn and grow spiritually, ultimately leading them towards liberation from the cycle of birth and death.

Dvaita Vedanta also teaches that the ultimate goal of life is to realize the true nature of the individual self as a part of Brahman and to attain moksha (liberation) from the cycle of rebirth. This realization can only be achieved through devotion and surrender to Brahman, and by living a moral and ethical life.

In summary, Dvaita Vedanta explains the existence of evil and suffering as a result of the inherent duality between Atman and Brahman. It also emphasizes the concept of karma and the ultimate goal of realizing one's true nature and attaining liberation from the cycle of rebirth. By understanding and accepting this duality, individuals can learn to transcend it and ultimately find peace and harmony within themselves and the world.