about comet and asteroid.............?

Question

what is comet.........

Answer 1

A ball of ice in many cases or a rock that has ice and what not breaking off as dust. That is why we can see the trails behind a comet.

Answer 2

The defintion of a comet is:
a celestial body that consists of a fuzzy head usually surrounding a bright nucleus, that has a usually highly eccentric orbit, and that often when in the part of its orbit near the sun develops a long tail which points away from the sun