What is the difference between semiring and hemiring?

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An algebraic structure equipped two binary operations is called a semiring if both the binary operations are associative and one of the operations distributes over the other. Hemiring also seems to be similarly defined. I am confused, where lies the difference?

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Semirings have a multiplicative identity.

(Using a standard, but silly misspelling), hemirngs need not have a multiplicative identity.