Difference between concentration and attention Is there any difference between concentration and attention ?

The dictionary definition and some websites on psychology mention they are same. whereas many people say they are different. I am unable to figure it out
Concentration is focusing on a task (e.g. reading a book). Attention is focusing on a person (e.g. listening during a conversation). The verb, focus, is the same in both instances. The noun, task and person, is the point of differentiation.