The Geneva Convention on Prisoners of War was signed at Geneva, July 27, 1929. Its official name is the Convention relative to the Treatment of Prisoners of War. It entered into force 19 June 1931. It is this version of the Geneva Conventions which covered the treatment of prisoners of war during World War II. It is the predecessor of the Third Geneva Convention signed in 1949.
On their web site, the International Committee of the Red Cross states that:
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A prisoner-of-war camp (often abbreviated as POW camp) is a site for the containment of enemy fighters captured as prisoners of war by a belligerent power in time of war.
There are significant differences among POW camps, internment camps, and military prisons. Purpose-built prisoner-of-war camps appeared at Norman Cross in England in 1797 during the French Revolutionary Wars and HM Prison Dartmoor, constructed during the Napoleonic Wars, and they have been in use in all the main conflicts of the last 200 years. The main camps are used for marines, sailors, soldiers, and more recently, airmen of an enemy power who have been captured by a belligerent power during or immediately after an armed conflict. Civilians, such as merchant mariners and war correspondents, have also been imprisoned in some conflicts. Per the 1929 Geneva Convention on Prisoners of War, later superseded by the Third Geneva Convention, such camps have been required to be open to inspection by representatives of a neutral power, but this hasn't always been consistently applied.
The Third Geneva Convention, relative to the treatment of prisoners of war, is one of the four treaties of the Geneva Conventions. The Geneva Convention relative to the Treatment of Prisoners of War was first adopted in 1929, but significantly revised on 12 August at the 1949 conference. It defines humanitarian protections for prisoners of war. There are 196 state parties to the convention.