The everyday use of 'affect' is the verb, meaning 'to influence' (his methods affected me greatly), but it also means 'to feign' (he affected nonchalance). The everyday use of 'effect' is the noun, meaning 'result' (the effect of this has been to make him proud) or 'influence' (he has had such an effect on me).
When someone is affected by something?
Affect is a verb meaning 'influence or cause someone or something to change': New technologies continue to affect how we live. Effect is a noun that means 'the result of an influence': The pollution in the city had a bad effect on me.
Is affected or is effected?
Affected and effected are two words that are commonly confused in writing, while their meanings are related they are very different. It's an action word of actually doing something, i.e. "He effected a reorganization of the finance department." Affected is used to describe something being impacted.