Qual é a diferença entre useful e helpful ?Podes indicar apenas respostas exemplo.

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.