Recovered territories refers to the pieces of land that were taken away from a country in the past by another country, but were later returned to the rightful owner through a peace agreement or a war victory.
Imagine that you have a toy that you really like and someone comes and takes it away without asking you. That person might play with it for some time or take it to his home, but later on, if he realizes that it was not fair or if he is forced to do so, he gives it back to you. That toy that you got back is like the "recovered territories" for a country.
The history of recovered territories is complex and can vary depending on the specific case, but one example is when Germany invaded Poland during World War II and took control of some Polish territories. After the war, those territories were returned to Poland as part of the peace agreement.
Another example could be the case of Taiwan, which was under Japanese control for many years, but was later returned to China. The Taiwanese people have since developed their own unique culture and identity, even though they are still part of China.
Overall, recovered territories are important for a country's sovereignty and history, as they represent a regained sense of control and ownership over a part of its land that was taken away.