Most of European and North American populations lives in urban environment which is cities and towns. Cities are very big towns with high population density. Houses are very close to each other, often with many flats in one building, so called blocks of flats. There live several families in one building, but often the neighbours do not know each other very well. This is why cities are sometimes criticised for their anonymity. On the other hand, cities provide a huge number of possibilities and opportunities such as jobs, services, culture, health facilities, educational facilities and other institutes. Services are shops and offices that provide goods and other help, e.g. supermarkets, haidressers, car shops, post offices, newsagent's, banks and other financial services, clothes shops, book shops, pharmacies, electronics and myriads of others.