What does it mean if a star is 400 light year's away?

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I think this sentence is  mean something is faraway from you . physicists tell us that the light goes about 3x10*(8) meters each second. So it means the distance is equal to the length that the light goes 400 years in the space. How far it is !

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One Light Year is about 10 trillion kilometers (10 000 000 000 000), you will have to fly for 400 years to reach it. If you want to go to the star, you must travel for 400 light years.
1 light second is 299.792.458 metres. so 400 light years is very far from earth

What does it mean if a star is 400 light year's away?

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