What is the meaning of Side_effect?

An unintended consequence, or secondary result, of any action, in addition to the main or intended consequence of that action.

1. An unintended consequence of a drug or therapy; usually an adverse effect, not a beneficial effect.

   An unintended consequence of a drug or therapy; usually an adverse effect, not a beneficial effect.

   A change in state outside of the local environment of the function being called.

   Source: wiktionary.org