The rishis are the seers to whom the hymns of the Veda were revealed, and the tradition claim about them is precise and unusual: they did not compose the hymns but saw them.
Seeing, not composing
In the traditional understanding the Vedic hymns are not human compositions but eternal truths that the rishis, in states of heightened perception, saw or heard and then transmitted, so the seer is the receiver and the channel of a revelation that exists independently of him. This is why the Veda is called shruti, that which is heard, and the rishis are honoured as the ones through whom it was heard, their names attached to the hymns not as authors in the ordinary sense but as the seers who received them. The claim sets Vedic revelation apart from a scripture written by inspired human authors.
The seven and the ideal
Tradition names groups of great rishis, above all the seven seers, the saptarishi, associated with the stars of the constellation the West calls the Great Bear, and the figure of the rishi became the ideal of the sage of profound realisation and vision. The office is not one that is entered by appointment or training but a status held by the ancient seers of the revelation, though the word came to be applied more widely to sages and holy men of great attainment. The rishi stands at the source of the Hindu tradition as the one through whom its foundational revelation was received, and the reverence paid to the seers is inseparable from the authority of the Veda itself.