
die Erscheinung
appearance
The outward appearance or form of a person or thing.
Mit seinem eleganten Anzug war er eine beeindruckende Erscheinung.
With his elegant suit, he was an impressive appearance.
appearance / phenomenon
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appearance
The outward appearance or form of a person or thing.
Mit seinem eleganten Anzug war er eine beeindruckende Erscheinung.
With his elegant suit, he was an impressive appearance.

phenomenon
An observable event or phenomenon, especially in nature or science.
Polarlichter sind eine seltene und wunderschöne Himmelserscheinung.
The northern lights are a rare and beautiful celestial phenomenon.

publication / release
The publication or release of a book, magazine, or other medium.
Die Erscheinung des neuen Bestsellers wird für nächsten Monat erwartet.
The publication of the new bestseller is expected next month.

apparition
A supernatural figure that suddenly becomes visible, for example a ghost.
Mehrere Zeugen berichteten von einer geisterhaften Erscheinung in der alten Burg.
Several witnesses reported a ghostly apparition in the old castle.
'Die Erscheinung' is the noun related to the verb 'erscheinen' (to appear), which means 'to become visible' or 'to show up'. All meanings of the noun have to do with something that can be seen or perceived.
Plötzlich erschien eine Gestalt im Fenster.
Suddenly, a figure appeared in the window.
When 'Erscheinung' (appearance) describes a person's appearance, it is rather formal or literary. It describes the overall impression, not just the clothing. It is often combined with adjectives such as 'elegant', 'gepflegt' (well-groomed), or 'auffällig' (striking).
Sie achtet sehr auf eine gepflegte Erscheinung.
She pays a lot of attention to having a well-groomed appearance.
In scientific or natural contexts, 'Erscheinung' is often used for phenomena. It frequently forms compound words such as 'Naturerscheinung' (natural phenomenon), 'Randerscheinung' (marginal phenomenon), or 'Modeerscheinung' (fad).
Der Regenbogen ist eine optische Erscheinung in der Atmosphäre.
The rainbow is an optical phenomenon in the atmosphere.
This meaning is almost exclusively limited to media and publishing contexts. When it is about books, magazines, articles, or films, it means publication or release.
Wir feiern die Erscheinung der 100. Ausgabe unserer Zeitschrift.
We are celebrating the publication of the 100th issue of our magazine.
The meaning 'Geist' (ghost) or 'Vision' (vision) is often recognizable from adjectives such as 'geisterhaft' (ghostly), 'übernatürlich' (supernatural), or 'plötzlich' (sudden). The context is usually mysterious, religious, or eerie.
Im alten Schloss soll es nachts zu unheimlichen Erscheinungen kommen.
There are said to be eerie apparitions in the old castle at night.
to look
Aussehen directly describes how a person or thing appears outwardly. Erscheinung is a noun for its outward form and often emphasizes the overall visual impression. Both can therefore express the same observation from different linguistic perspectives.

Im neuen Anzug ist Paul eine elegante Erscheinung.
In his new suit, Paul is an elegant sight.
Mit dem neuen Anzug sieht Paul elegant aus.
Paul looks elegant in his new suit.