an example of a suburb is residential area on the edge of a city or large town

Yep. What is your question?

The mostly residential area around a city

That's correct! A suburb is typically a residential area located on the outskirts of a city or large town. It is known for having a more suburban atmosphere, with a mix of housing styles such as single-family homes, townhouses, and apartments. Suburbs are often characterized by lower population density compared to urban areas and are popular among families looking for a quieter living environment while still being close to urban amenities and job opportunities.