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A trailer park is a semi-permanent or permanent area for mobile homes or travel trailers. The main reasons for living in such trailer parks are the often lower cost compared to other housing, and the ability to move to a new area more quickly and easily, for example when changing jobs to another part of the country taking the mobile home/trailer with them.
Trailer parks, especially in American culture, are stereotypically viewed as lower income housing whose occupants live at or below the poverty line, have low social status and lead a desultory and deleterious lifestyle. Despite the advances in trailer home technology, the trailer park image survives, as evoked by a statement from Presidential adviser James Carville who, in the course of one of the Bill Clinton White House political scandals, suggested "Drag $100 bills through trailer parks, there's no telling what you'll find"," in reference to Paula Jones. It is also seen in the Canadian mockumentary Trailer Park Boys.
Tornadoes and hurricanes often inflict serious damage on trailer parks, usually because the structures are not secured to the ground and their construction is significantly less able to withstand high wind forces than regular houses. However, most modern manufactured homes are built to withstand high winds as well as a mainstream home, using hurricane straps and proper foundations.
By country 
In the United States 
This perception of trailer parks was not improved by the creation of emergency trailer parks by the Federal Emergency Management Agency (FEMA) for the displaced victims of Hurricane Katrina, the quality and temporary nature of which was disputed. Many stereotypes have developed regarding people who live in trailer parks, which are similar to stereotypes of the poor and the term Trailer trash often used as an adjective in the same vein as the derogatory American terms white trash or ghetto. Though trailer parks appear throughout the United States, they are often associated with the Deep South and rural areas.
More recently referred to in the U.S. as mobile home communities or manufactured housing sites, the stereotypes are often just that. Retirement communities exist in many locales that permit mobile home parks as "over-50 parks". Homeowners must be over the age of 50 and persons under the age of 21 are rarely permitted to live there. These can be gated communities with amenities such as swimming pools, clubhouses and on-site maintenance. Homes are often permanently installed on foundations. However, in certain circumstances residents may not own the land their homes occupy.
Outside United States 
In Europe, particularly in Germany and Spain, where trailer parks are less common (but exist) as 'normal' accommodation, disputed trailer parks exist that squat on land near urban centers (Berlin, Hamburg, Barcelona). Names for such phenomena include Wagenburg, Wagendorf or Bauwagenplatz (all German, meaning: "wagon fort", "trailer village" and "construction trailer place" respectively) and people living there are often associated with certain ethnic groups such as Romani, or with the punk movement, New age travelers, Irish travelers and a do-it-yourself punk ethic. On the whole, however, trailer parks are much less common in these countries than they are elsewhere and in United States and are much less emblematic of a distinct lifestyle and membership to a certain social class.
In Germany, Netherlands and some other European countries local law allows for normal camping at RV parks for a short time and seasonal camping for holiday makers, and also long-time camping (for years) with hardly movable travel trailers. Sometimes the inhabitants also cultivate a garden. Some cities allow a long-time camping lot to be the regular address registered with the authorities, others do not. Many of mobile home plots are offered by RV parks that allow for all sorts of camping and offer extra plots for mobile homes (static caravans).The cost for such a plot tends to be between 400 € and 1.500 € a year, depending on the location and facilities.
In France, living in a trailer or mobile home for more than three months is prohibited by law, even if the resident owns the land, however, building requirements and permissions for self building of recreational solid (static) country cottages are more relaxed in France if one stays within a certain amount of square meters.
In the United Kingdom, "trailers", or mobile homes are generally used for one of two purposes. Firstly as holiday homes, designed for short-term living. And secondly as retirement homes for the elderly, designed for long-term occupancy. Both types of trailers usually enjoy good amenities and are surrounded by highly manicured gardens.
In Australia, there is generally no differentiation between a trailer park and an RV park. The term "caravan park" is used to refer to both. In New Zealand, favona, auckland is an area where trailer parks are concentrated.