A loanword is a word which has been adopted from another language.
An English we have many loanwords. E.g., pizza (from Italian), restaurant (from French), kindergarten (from German), safari (from Swahili), avatar (from Sanskrit), ketchup (from Hokkien), futon (from Japanese).
Often loanwords are integrated into the sound system of the language they’re being borrowed into – for example, we don’t use the French pronunciation of restaurant when we use the word in English.
All languages borrow words from other languages.
Aboriginal languages use loanwords from other Aboriginal languages or from English. Some languages of the Top End of Australia have borrowed words from Indonesian from the time of trade with Macassans, such as djurra (or djorra) for book or paper, and rupia for money.
See here for a list of words from Queensland languages.