Romaja literally means Roman letters in Korean, and refers to the Roman alphabet. "Romaja" is not to be confused with "romanization." The former can be applied to any use of the Roman alphabet in Korean text—whether for Korean or non-Korean words or names—while the latter refers to writing Korean words using the Roman alphabet: either romanizing individual words in a Korean text, or writing an entire Korean text in the roman alphabet.
See also
Not to be confused with: Romaji (use of Roman letters in Japanese)
