City Ebikes
The term "city bike" doesn't refer to a specific category of bikes; it's more of a general descriptive term. They might also be called "commuter" or "urban" bikes. However, there is a certain type of bike that some people have in mind when they use the term "city bike". This bike has characteristics of both a hybrid bike and a cruiser bike--usually the upright riding position of a cruiser, but the wheel size of a hybrid bike.
A city bike might also have an internally geared rear hub for ease of use and maintenance, and a built-in generator and lights for safety when riding after dark.
These bikes are also sometimes called "Dutch bikes," because they resemble the everyday bikes used in Amsterdam and other bike-friendly European cities.