Affect and effect

Affect is usually a verb.

1. To influence someone or something, or cause them to change.

• It’s a disease which affects many younger people.
  
• The noise affects my performance.
  
• The problem affects everyone.
  

2. To cause a strong emotion, especially sadness (often passive).

• The house was affected by the fire.
  
• He was deeply affected by the film.
  
• The people are affected by flood.
  
  

Effect is usually a noun.
A change, reaction, or result that is caused by something.

• The promotion had a huge effect on his life.
  
• Effects of the flood are destructive.
  
  

Effect as a verb:
To make something happen.

• The quit India movement effected a huge change.