The Difference Between Effectiveness and Efficiency

I would think an instructor is like if you are taking a smaller class on the side versus being in school. A lot of people still call that person a teacher too. I wouldn't use that term with us because we teach common more traditional subjects. Yeah. Maybe if you went to an art class at night, I feel a teacher but could be an art instructor too. Oh, this might be. Gris, hello. What's the difference between effectiveness and efficiency? Both are really very close meaning you do something well without wasting time. So I'm sure trying to think probably a different part of speech. But I hope that helps.