difference between efficiency and effetiveness?

兩個根本唔同意思既字，唔好搞亂

efficiency係”效率”

effectiveness係”有效”／”效用”

唔知你覺唔覺中文既”效率”同”效用”意思上都好大分別？其實呢個唔係英文用法上既分別，而係意思上既分別

例如你話：
高效率：high efficiency
有效用：with effectiveness

請用中文諗諗以下例子：
你可以話某人做事好有效率，但係你唔會話佢做事好有效
你可話一個計畫對一件工作好有效，但係個計畫又點可以對件工作有效率呢？

唔知你明唔明我既意思，如果唔明，請再補充發問

Efficiency mainly refers to the fast speed of doing something correctly. To be "efficient" means that you completed a task quickly and well.

Effectiveness is quite similiar, but refers more to the result of something, regardless of the speed of completing the task.

Simply speaking, "efficiency" focuses more on the speed, and is mainly used in a sentence to describe a person or company, etc.,
while "effective" focuses more on the result, and is used in a sentence to describe a plan, or an idea, but not a person