“Karma” is a Sanskrit word that originally meant “deed.” Karma is a universal law of cause and effect concerned with intentional deeds. The law of karma tells us that all intentional deeds produce results that eventually will be felt by the doer of the deed. Good deeds produce good karmic effects and bad deeds produce bad karmic effects. Karma operates at more than just one level; individuals have karma, groups of people and societies have karma, countries have karma, and the earth as a whole has a karma that belongs to all the sentient beings that inhabit it.
The concept of karma is central to all schools of Buddhism and all interpretations of the Dharma. No one could possibly understand Buddhism without fully understanding the concept of karma.
The Buddha divided human karma into three types: karma generated by acts of the body, karma generated by acts of speech, and karma generated by acts of mind. All intentional acts of body, speech, and mind produce karmic results that will inevitably occur. Even a Buddha cannot change the law of karma.