People often confuse the words "affect" and "effect". They sound so similar and are easy to mix up.
What is the difference between these two words?

According to Merriam Webster dictionary, affect is usually used as a verb and means: :
-to produce an effect upon: as a: to produce a material influence upon or alteration in b: to act upon (as a person or a person's mind or feelings) so as to effect a response : influence

Effect is mostly used as a noun and means:
-an outward sign : appearance
-accomplishment, fulfillment
-power to bring about a result : influence

Example sentences:
-The medicene will affect your stomach, so make sure to eat before you take it.
-On of the side effects of the medicine is that it will cause nausea.