Both "Schloss" and "Burg" are German words used to refer to a type of fortified or castle-like structure, but there is a difference in their usage.
"Schloss" generally refers to a palace or a grand residence that was built primarily for the purpose of showing wealth and prestige, as well as serving as a residential dwelling. Schlosses typically have ornate and lavish decorations and were used as a symbol of power by the aristocracy. One example of a "Schloss" would be the famous Neuschwanstein Schloss.
On the other hand, "Burg" refers to a fortified castle that was built primarily for defense purposes. Burgs were typically built on strategic locations such as hills, mountains or near water sources and served as a residence for nobility, as well as a stronghold for military operations.
In summary, "Schloss" refers to a grand palace or residence, while "Burg" refers to a fortified castle or stronghold, built primarily for defense.