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What is the relationship between Hobgoblins and Goblins?

I am nearly starting a new campaign. I want to have every race a cool backstory to build on it, and I am wondering, what is the relationship between Goblins and Hobgoblins?

Is the Hobgoblin just an evolved version of the Goblins, or am I wrong? Is there any source which describes it?

Why do hobgoblins hates elves?

Monster Manual, page 185, tell that hobgoblins

hate elves and attack them first in battle over any other opponents, even if doing so would be a tactical error.

But why do they does this? What is the reason?

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