The difference between a town and city hinges on size. However it is more complex than that. In common speech, you can say "My home town is Rio de Jainero" but Rio de Jainero is obviously a large city. If you asked an everyday English speaker to define the difference, they would say a town is smaller than a city. A town is probably around a few thousand people. The term city can be used for settlements of around 40,000 people in the West. If you are an urban architect or an administrator, there are legal defintions used to decide if you are dealing with a town or city. That legal definition varies between countries, and even states within countries.

To make things even more confusing, people within a city will refer to that city in terms of a town: "What part of town are you from?" "I live uptown." "When is your family coming to town?" "We are going to paint the town red!" - This an expression that means we are going to have a great time around town. "The boys are back in town!" etc.

A city is a large population center. For example, New York, London, São Paolo, and Tokyo are all cities. Cities vary in size but are much larger than towns. A town is usually a small population center typically found in more rural or sparsely populated areas. The term village can often be confused with town but is usually even smaller than a town. A village, in strictest terms, is perhaps only a few homes or families living in one place. In many large cities, there are neighborhoods that are also called "village". This is typically just the name of the neighborhood and not individually governed. Hope this helps.

A city is typically larger than a town

@Felipe Ferreira, Obrigado~Excuseme, Onde é a sua cidade natal?