Usage Discussion of affect Effect and affect are often confused because of their similar spelling and pronunciation. The verb to affect usually has to do with pretense <she affected a cheery disposition despite feeling down>. The more common affect denotes having an effect or influence <the weather affected everyone's mood>. The verb effect goes beyond mere influence; it refers to actual achievement of a final result <the new administration hopes to effect a peace settlement>. The uncommon noun affect, which has a meaning relating to psychology, is also sometimes mistakenly used for the very common effect. In ordinary use, the noun you will want is effect <waiting for the new law to take effect> <the weather had an effect on everyone's mood>. http://www.merriam-webster.com/dictionary/affect

Effect is to cause or change something, to add something to make something, to create something. Ex: The effects of smoking is dangerous to your health. while Affect is an aftermath of what happens, influences, the result, the impact. Ex: The wildfires in Canada can affect the lives of the animals, as well as the tourist attraction.

The difference is that effect is a noun, but affect is a verb.

Affect is a verb and Effect is a noun For example :- - Smoking affects the human health. - The effect of smoking on our health is by damging our lung In the 1st sentense " Affect " has written as a VERB .But , in the 2nd one " Effect " has written as a NOUN