Affect and effect are two of the most commonly confused words in English. They sound and look similar, and even relate in meaning — but they have different grammar functions and are used in different ways.

b : to cause illness, symptoms, etc., in (someone or something) a disease that affects millions of patients each year

Generally, we use affect as a verb (an action word) and effect as a noun (an object word). What Does Affect Mean? The verb affect means “to act on; produce a change in” as in, “The cold weather …

affect somebody/something to produce a change in somebody/something. How will these changes affect us? The article deals with issues affecting the lives of children. Thousands of people have been …

Is there some concept, identifiable as 'perception', which affects or controls a human being's knowledge of the surrounding landscape?

What's the difference between affect and effect? Affect is most commonly used as a verb meaning to act on or produce a change in someone or something.

When something affects someone or something, it influences them or causes them to change. ...decisions that would affect me for the rest of my life.