Can you describe really well a city?

a large or important town.

an incorporated municipality, usually governed by a mayor and a board of aldermen or councilmen.

the inhabitants of a city collectively

a municipality of high rank, usually based on population.

a borough, usually the seat of a bishop, upon which the dignity of the title has been conferred by the crown.

the major metropolitan center of a region;

Modern cities are known for creating their own microclimates. This is due to the large clustering of hard surfaces that heat up in sunlight and that channel rainwater into underground ducts.

Garbage and sewage are two major problems for cities, as is air pollution coming from internal combustion engines (see public transport). The impact of cities on places elsewhere, be it hinterlands or places far away, is considered in the notion of city footprinting (ecological footprint). Other negative external effects include health consequences such as communicable diseases, crime, and high traffic and commuting times. Cities cause more interaction with more people than rural areas, thus a higher probability to contracting contagious diseases. However, many inventions such as inoculations, vaccines, and water filtration systems have also lowered health concerns. Crime is also a concern in the cities. Studies have shown that crime rates in cities are higher and the chance of punishment after getting caught is lower. In cases such as burglary, the higher concentration of people in cities create more items of higher value worth the risk of crime. The high concentration of people also create traffic problems and higher commute times, causing less time to be spent on more valuable activities.