"Suburb" covers a lot of ground. There's the classical US cul-de-sac development of course. But people also use the term to encompass small cities and the periphery of larger cities that are mostly spread-out single family homes often generally lacking the ability to easily walk to stores, etc. Or largely exurban towns that may have a center but with homes often spread over a number of acres. (Which are still often considered urban by the US Census because they're basically within an hour or so of a larger city.)