Generally the full or long-form record from the civil registry, showing the parents' names. USCIS officers use the State Department's reciprocity and civil documents schedule to check which birth record each country issues and whether it is considered available.
Birth records come in very different shapes around the world: a civil registry certificate, a full copy of the register entry, a notarial birth certificate, or a page from a household or family register. The State Department's "Reciprocity and Civil Documents by Country" pages on travel.state.gov list, country by country, which version to request, which office issues it and which records are unavailable. Short-form extracts that leave out the parents are the classic problem, because they can't prove a relationship on an I-130.
If the schedule says a record is unavailable, or your birth was registered late, USCIS can consider secondary evidence such as school or religious records. We translate whichever version you have. A translation is faithful by design, so a short extract stays a short extract in English, however hopefully it's formatted.