Every action has an equal and opposite reaction.
Sir Isaac Newton.
My son recently introduced me to a YouTube channel which featured episodes labelled “Instant Karma”. There are a series of video clips showing people who are behaving badly getting their come uppence from the environment around them.
This “payback” element seems to fit with the common conception of karma. However this is not the whole story. On a simple level Karma can be seen as “If you behave badly/well then bad/good things will happen to you.” Such a world view would make a reasonable philosophy for living our lives.