Swarg is typically portrayed as a blissful, heavenly realm where virtuous souls are rewarded with pleasure, happiness, and luxury. It is often depicted as a place of abundance, where the residents enjoy all kinds of material and spiritual pleasures.

On the other hand, Nark is portrayed as a dark, miserable realm where sinful souls are punished with suffering, pain, and torment. It is often depicted as a place of punishment, where the residents are subjected to various forms of torture and misery.

It is important to note that the concepts of Swarg and Nark are not simply physical places, but rather symbolic representations of the consequences of one's actions in life. The ultimate goal of Sanatana Dharma is to achieve liberation or moksha, which is freedom from the cycle of birth and death and the attainment of spiritual enlightenment. The concepts of Swarg and Nark are meant to inspire individuals to live a virtuous life and avoid negative actions that can lead to suffering and rebirth in lower realms.

In the Vedas, the concept of Swarga and Narak are described as two different realms or planes of existence. Swarga refers to a heavenly realm, a place of pleasure, happiness, and blissful existence, while Narak refers to a realm of suffering and pain, often equated with hell.

In the Vedas, the concept of Swarga and Narak is closely associated with the idea of karma, which suggests that one's actions in life determine their ultimate destiny in the afterlife. Good deeds lead to a place in Swarga, while bad deeds lead to Narak.

However, it's worth noting that the Vedas are a complex and diverse collection of ancient texts, and the ideas of Swarga and Narak may be interpreted differently in different schools of thought within Sanatan Dharma. Additionally, other later Hindu texts, such as the Puranas and the Bhagavad Gita, provide more elaborate descriptions of Swarga and Narak, and how one can attain a favorable destination after death through various spiritual practices.