Đâu là sự khác biệt giữa useful và helpful ?Hãy thoải mái đưa ra các câu ví dụ nhé.

They are often used synonymously,
That information was useful.
That information was helpful.
but there is a slight difference in meaning.
Useful means having a practical or beneficial application.
Helpful means providing aid.
So, useful is more often used for machines or tools, while helpful is more often used for people.
That is a useful blender.
He is a helpful person.
If you say
He is a useful person, it does not necessarily mean that he is willingly providing help; it can just mean he has a practical application.
He is useful to have around because he talks too much, and I can always find out what the boss is thinking.