Resources
You want a clean, simple answer to this, and you deserve one. The honest answer is: it depends heavily on what state you're in — and pretending otherwise would mislead you. In some states a "restraining order" and a "protective order" are genuinely different things; in others the terms are used more or less interchangeably; and the categories, names, and rules vary from place to place. So instead of a false one-size answer, here's the general landscape, and how to find what's true where you live.
Across states, what you'll run into is some version of a court order that limits another person's contact with you or proximity to you. Depending on where you are, it might be called a restraining order, a protective order, an order of protection, or a no-contact order.
A few general patterns worth knowing (general — not universal):
The name matters less than two things: what you need the order to do, and what your state actually offers. Don't let the terminology trip you up or talk you out of asking. The protection you're looking for may well exist — it just goes by a local name and a local process.
This is general information to orient you, not legal advice — and because the specifics genuinely vary by state, this is a topic where you really do need your state's resources or an advocate before you act.
And if you're in immediate danger, that comes first — call 911 or see crisis resources.
Don't let unfamiliar vocabulary intimidate you out of asking for protection. The order you need has a name where you live, and an advocate can match it to your situation. (Here are more legal words, plainly.)
These orders go by different names and rules in every state. Choose yours for WomensLaw.org's plain-language guide to restraining orders where you live. Opens WomensLaw.org in a new tab.