Sworn Translations are very common in Spain for expats with documents from their country of origin that need to be in the Spanish language.
The Spanish authorities do require that the written translations are made by an official Spanish Sworn Translator.
The apostille is where a foreign official document is certified by a country of origin that produced the document to be real.
Such as police reports for visas, marriage or birth & medical certificates.
Covered offer both of these services with their sworn translator and Apostille for Visa, residency and other requirements.