What is the difference between a star and a constellation?

Answer 1

A constellation is a group of stars. Nearly all cultures have organised stars into groups because, when see with their surrounding stars, they can outline the vague shape of people, animals or other objects.

Answer 2

A star is a luminous sphere of plasma held together by gravity, while a constellation is a group of stars that form a recognizable pattern when viewed from Earth. Stars are individual celestial bodies, while constellations are arrangements of stars as seen from our perspective.