der Zauber
charm
A special, fascinating aura or atmosphere that comes from a place, person, or moment.
Der Zauber der alten Ruinen bei Sonnenuntergang war unbeschreiblich.
The charm of the old ruins at sunset was indescribable.

magic / charm
Loading your saved state.
charm
A special, fascinating aura or atmosphere that comes from a place, person, or moment.
Der Zauber der alten Ruinen bei Sonnenuntergang war unbeschreiblich.
The charm of the old ruins at sunset was indescribable.

The noun 'der Zauber' is closely related to the verb 'zaubern' (to do magic) and the adjective 'zauberhaft' (very beautiful, as if enchanted). All the words share the basic idea of something magical or fascinating.
Die Köchin kann aus einfachen Zutaten ein Festessen zaubern.
The cook can conjure up a feast from simple ingredients.
You can recognize the meaning of 'Zauber' from the context. If it is about a fascinating atmosphere, the figurative meaning is intended. If it is about witches or magicians, it means a real magic spell. In colloquial complaints about effort, the third meaning is intended.
Der erste Schnee hat immer einen besonderen Zauber.
The first snow always has a special charm.
To describe the special aura, 'Zauber' is often used with the genitive or the preposition 'von' + dative. This expresses where the fascination comes from.
Wir genossen den Zauber einer sternenklaren Nacht.
We enjoyed the charm of a starry night.
In the sense of magic, 'Zauber' is often combined with certain verbs. Typical phrases are 'einen Zauber wirken' (to cast a spell), 'einen Zauber sprechen' (to say/utter a spell), or 'jemanden mit einem Zauber belegen' (to put someone under a spell).
Der Magier wirkte einen Zauber, um die Tür zu öffnen.
The magician cast a spell to open the door.
The colloquial meaning for 'Aufwand' (effort/fuss) is almost always used in the fixed expression 'einen Zauber machen' (to make a fuss) or 'einen Zauber veranstalten' (to make a big fuss).
Wegen der kleinen Party müssen wir doch nicht so einen Zauber veranstalten.
We really don't need to make such a fuss over the small party.
theater
'das Theater' and 'der Zauber' can both colloquially mean something exaggerated or unnecessarily complicated. 'Theater' fits better when someone reacts loudly, dramatically, or agitatedly. 'der ganze Zauber' means more like all the fuss, the complicated business, or the mess. Learners may confuse the words because both sometimes speak negatively about a situation. As a practical rule: with strong emotions, you are more likely to say 'Theater'; with a lot of unnecessary effort, 'der ganze Zauber' is more likely.

Nach zehn Minuten war der ganze Zauber mit dem Formular erledigt.
After ten minutes, all that fuss with the form was taken care of.
Mach bitte kein Theater wegen einer kleinen Verspätung.
Please don't make a fuss over a small delay.