Astronomers call these collections constellations, meaning, literally, a group or set of stars. They're pretty handy! Over millions of years, the brain has evolved a decently sophisticated pattern-recognition system, and for humans, this means we're hardwired to spot constellations and to use them as landmarks in the sky.
Cultures all over the world see these patterns in the stars, and nearly all assign them with stories and myths—not that all these stories are the same. For example, the ancient Greeks saw the constellation Pegasus as a flying horse, but in China it was part of a tortoise and in India a bed for the moon.
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