Organized crime is a group of individuals that plan and participate in illegal criminal activities. The main goal of most of these kinds of organized groups is to make money. An example of organized crime is the mafia, or mob. Terrorist groups are another example of an organized criminal group.
Unorganized crime is crime that is committed without any sort of organized group involved. Many times it is not planned either. They include crimes such as robberies, vandalism, etc. Sometimes people commit these crimes to steal money but sometimes they are committed for other purposes.
Many crimes are committed for the purpose of gaining a monetary reward, and the only difference between organized crime and non-organized crime is the centralized organization and coordination that exists in the former. Organized crime is often described as a mafia in many countries, but it consists of a hierarchical structure where there are similar break downs to those you might find in a large or small company. There are those who plan and those who commit the crimes, there are also people who may work in more legitimate enterprises that serve as points where money can be laundered or shell companies can be used to create legal places for income streams, etc. Again, the main difference is a simple one, organized crime is organized and planned and controlled and non-organized crime isn't centrally planned or coordinated.
Organized crime refer to large-scale crimes committed by relatively stable groups of professional criminals like gangsters and racketeers. These type of criminals form what is commonly described as the underworld or the crime syndicates. Generally such crimes are committed as a part of business in involving activities like gambling, prostitution, sale of drugs, and loan-sharking. Organized crime is frequently also involved in activities like extortion, kidnapping, and contract killing on a regular basis. One famous organization in Sicily that indulged in large scale organized crime is Mafia. Because of the notoriety gained by this organisation, the groups indulging in organized crime of any kind are sometimes called mafias.
There is no specific definition of non-organized crime. Perhaps any crime that is not organized crime comes under the category of non-organized crime. These crimes would include a very wide range from petty thefts and spontaneous acts of violence to big well planned robberies and murders. It will include many different categories of crime like white collar crimes and political crimes.