What do you mean by colony, concession and concession? What is the difference?

A country leases the territory of another country for a certain period of time for the purposes stipulated in the treaty. The concept of leasehold is a lease relationship borrowed from domestic law. The sovereignty of the leased land is not transferred. The lease is only valid within the agreed period, during which the lessor obtains the right to use the land. The land leased by imperialist countries in Asian and Latin American countries was obtained by forcing these countries to conclude unequal treaties. During 1898, under the pressure of imperialist powers, the Qing government of China leased JIAOZHOU Bay to Germany (99), Lushun and Dalian to Russia (25), Ahava (25) and Kowloon (99), and Guangzhou Bay to France (99). After the Russo-Japanese War and the First World War, Japan transferred China's leasehold rights in Lushun, Dalian and Jiaozhou Bay to Russia and Germany in 1905 and19 respectively. Except for Kowloon, the above leased land has been recovered in Jiaozhou Bay 1922, ahava 1930 and Guangzhou Bay 1945. 1945, Dalian became a free port, and the Soviet Union gained "superior rights and interests" in the port. Lushun became a naval base jointly used by China and the Soviet Union, and China's sovereignty was fully restored in 1954. 1903, the United States provoked Panama's independence and concluded the Treaty on the Construction of the Transocean Canal (see Transocean Canal). According to this treaty, Panama permanently ceded the area 10 mile wide needed for the construction of the Panama Canal to the United States for "use, possession and control", which is similar in nature to leasing, but not exactly the same, because it is "permanent" and has no time limit. After the resolute struggle of the Panamanian people, 1977, the U.S. government and the Panamanian government signed a new Panama Canal Treaty, agreeing that Panama would gradually recover its jurisdiction over the canal area, and stipulated the time limit for the canal area and the canal to be returned to Panama.