What does concessions mean in the following paragraph? What were the concessions?

The leader of the Czech Nazi Party, Konrad Henlein, was urged by Hitler to demand that the Czech government make concessions to the Sudeten Germans. Henlein kept the pressure on the Czechs by asking for more and more concessions. In April 1938, German troops began massing on the Czech border. Czechoslovakia's President, Benes, mobilised his troops to resist the Germans. Britain and France wanted to avoid war so they persuaded Benes to make further concessions to the Sudetens. It became clear that Hitler would never be satisfied with improved rights for the Sudeten Germans. What he wanted was to make the Sudetenland part of Germany.

Hope you can explain. Many thanks.