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Removed double translation as per https://spanish.meta.stackexchange.com/questions/198/should-we-have-both-languages-in-titles
jacobo
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Etymologically, why do "ser" and "estar" exist?

This is a canonical question / Esta es una pregunta canónica

Ser and estar both mean "to be" in English. I understand this and also understand when to use each.

Why, however, do these two verbs exist?

Since Portuguese is similar in this respect, is there a common Old Spanish or perhaps Latin root?