While the words sound similar, they are completely different.
Effective
is related to the noun effect.
To have an effect on something means that you are able to influence it somehow. If something is effective, it works well and helps you in a positive way. An example is
- an effective medicine, which helps reduce your fever or cure your sickness.
Another is
- an effective learning method, which you can use to learn something quickly.
Affective
is related to the verb affect.
To affect something is to change it somehow. When used in the adjective form, something that is affective influences your emotions.
- The sad movie that you saw can be affective, as can the championship that you just won!
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