What is dumping? Why it can be legitimate source to restrict imports by the countries?

en.wikipedia.org/wiki/Dumping

Dumping may refer to:

Contents
1 Computing
2 Economics
3 Waste management
4 Aircraft technology
5 Mathematics
6 Medicine
7 Other uses
8 See also

Computing
Recording the contents of memory after application or operating system failure, or by operator request, in a core dump for use in subsequent problem analysis.
Dump, strict data cloning pertaining to storage devices; related to backup

Economics
Dumping (pricing policy), in international trade, the pricing of a product below its cost of production
Social dumping, using transitory labour to save costs
SUTA dumping, the avoidance of paying unemployment insurance taxes

Waste management
Environmental dumping, the shipping of waste to a country with lax environmental laws
Ocean dumping, the deliberate disposal of waste at sea

Aircraft technology
Fuel dumping, used to lighten the aircraft's weight in certain emergency situations

Mathematics
Equivalent dumping coefficient, used in the calculation of the energy dispersed when a building moves

Medicine
Gastric dumping syndrome, when intestines fill too quickly with undigested food from the stomach
Homeless dumping, medical workers releasing homeless patients on the streets
Emergency Medical Treatment and Active Labor Act, or patient dumping, the refusal to treat people because of inability to pay or insufficient insurance

Other uses
Dumpin', a 1999 album by hip-hop group Psychopathic Rydas
Defecation, the final act of digestion

See also
Dump (disambiguation)
Litter
Dumper (disambiguation)
Damper (disambiguation)
Damping (music)
Dumpling (cuisine)