Easily confused and related in meaning, but not the same!
These two words are easily confused; they have a similar pronunciation and their meanings are related!
Let’s look at them in more detail.
Verb (in the active form): to have an influence on someone or something; to make a difference to someone or something; The cold temperature affected me very badly today, I’m really sick!
It’s a disease that affects mainly newborns and toddlers.
The new rates will affect all consumers
Verb (in the passive form): to be influenced emotionally by something; to be upset Tom was deeply affected by the break-up (= he was upset) The film on the Irish famine deeply affected me (=it caused strong feelings in me)
Noun: emotion (as used in psychology) Depressed people usually display flat affect
Noun: the result of a particular influence The Brexit vote had a disastrous effect on the value of the pound Everyone knows the sun has a good effect on mood!