Buddhism first appeared in Thailand during the 3rd century B.C. in the area of the present day provincial capital Nakhon Pathom. Once established, it proved such a durable and pervasive force that some ethnic groups who migrated into that area during the Dvaravati period readily adopted it as their state religion.

Briefly, Buddhism teaches that one's life does not begin with birth and end with death but is a link in a chain of lives, each conditioned by volitional acts (karma) committed in previous existences. The concept of karma, the law of cause and effect, suggests that selfishness and craving result in suffering. Conversely, compassion and love bring happiness and well-being. Therefore, only by eliminating desire can one find peace of mind. The ideal Buddhist aspiration is to attain perfection through Nirvana (Nibbhana), an indescribable, immutable state unconditioned by desire, suffering, or further rebirth, in which a person simply is, yet is completely at on with his surroundings.

After its introduction into Thailand, Buddhism gained wide acceptance because its emphasis on tolerance and individual initiative complemented the Thai's cherished sense of inner freedom. Fundamentally, Buddhism is an empirical way of life. Free of dogma, it is a flexible moral, ethical, and philosophical framework within which people find room to fashion their own salvation.