Burg vs. Schloss
While both the German words Burg and Schloss can be translated as castle, they describe distinct types of buildings from different eras with different primary functions.
Burg
A2A Burg is a medieval fortress or stronghold. Its main purpose was defense, which is reflected in its architecture: thick walls, high towers, small windows, and often a location on a hill or by a river for strategic advantage.
Im Mittelalter schützte die Burg die Bewohner vor Angriffen.
(In the Middle Ages, the fortress protected the inhabitants from attacks.)
Die alte Ruine auf dem Berg war einst eine mächtige Burg.
(The old ruin on the mountain was once a mighty fortress.)
Ritter lebten und trainierten oft in einer Burg.
(Knights often lived and trained in a fortress.)
Vom höchsten Turm der Burg hat man eine strategisch gute Aussicht.
(From the highest tower of the fortress, one has a good strategic view.)
Schloss
A2A Schloss is a palace, château, or stately home. It was built primarily as a luxurious residence for nobility or royalty, focusing on comfort, representation, and opulence rather than defense. They are often from the Renaissance, Baroque, or later periods and feature large windows, grand halls, and ornate gardens.
Der König lud zu einem großen Fest in sein Schloss ein.
(The king invited guests to a grand celebration at his palace.)
Das Schloss ist von einem prächtigen Park umgeben.
(The palace is surrounded by a magnificent park.)
Viele Touristen besuchen das berühmte Schloss in Bayern.
(Many tourists visit the famous palace in Bavaria.)
Das Museum befindet sich heute in einem alten Schloss am See.
(The museum is now located in an old palace by the lake.)
Summary
In short, a Burg is a fortified, medieval military structure built for defense. A Schloss is an opulent, post-medieval palace built for residential and representative purposes. Think of a Burg as a fortress and a Schloss as a palace. Over time, many a Burg was rebuilt or expanded to become a more comfortable Schloss.