erscheinen
to appear
To become visible or come into view.
Nach dem Regen erschien ein doppelter Regenbogen am Horizont.
After the rain, a double rainbow appeared on the horizon.

to appear
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to appear
To become visible or come into view.
Nach dem Regen erschien ein doppelter Regenbogen am Horizont.
After the rain, a double rainbow appeared on the horizon.

'Erscheinen' (to appear) is an inseparable verb derived from 'scheinen' (to shine, to seem). The prefix 'er-' often indicates the beginning of a process. So 'erscheinen' means that something begins to become visible or to have an effect.
Plötzlich erschien ein Licht am Ende des Tunnels.
Suddenly, a light appeared at the end of the tunnel.
The verb 'erscheinen' (to appear) always forms the perfect tense with the auxiliary verb 'sein' (to be). This is because it describes a change of state or appearing at a place.
Der Film ist letztes Jahr erschienen.
The film was released last year.
In the meaning 'anwesend sein' (to be present), 'erscheinen' (to appear) is often used in a formal or official context. For example, people speak of 'zu einem Termin zu erscheinen' (to appear for an appointment) or 'vor Gericht zu erscheinen' (to appear in court).
Der Angeklagte ist nicht vor Gericht erschienen.
The defendant did not appear in court.
In the meaning 'veröffentlicht werden' (to be published), 'erscheinen' (to appear / be published) is used exclusively for media products. Typical phrases are 'ein Buch erscheint' (a book is published), 'eine Zeitschrift erscheint wöchentlich' (a magazine is published weekly), or 'ein Artikel erscheint online' (an article is published online).
Sein neuer Roman ist gerade erst erschienen.
His new novel has only just been published.
When 'erscheinen' (to seem) means that something makes a certain impression, the person who has the impression is in the dative. The construction is often: 'etwas erscheint jemandem + Adjektiv' (something seems + adjective to someone).
Diese Aufgabe erscheint mir sehr kompliziert.
This task seems very complicated to me.
This meaning is used almost only for supernatural beings such as ghosts and angels, or in visions and dreams. The person who has the apparition is in the dative.
Im Traum ist ihm sein verstorbener Großvater erschienen.
In a dream, his deceased grandfather appeared to him.
to come
'kommen' and 'erscheinen' can both mean that someone shows up at a place. 'kommen' is neutral and very common in everyday language. You use it for visits, meetings, and normal trips to a place. 'erscheinen' sounds more formal and is especially suitable for official appointments, invitations, events, or obligations. Learners may confuse the words because both describe presence. In everyday life, people usually say 'kommen'. You choose 'erscheinen' when the occasion sounds more official or the person's presence is expected.

Wegen des wichtigen Termins muss der Kunde persönlich im Amt erscheinen.
Because of the important appointment, the customer has to appear in person at the office.
Kommt ihr morgen nach der Arbeit noch zum Lernen vorbei?
Are you coming by tomorrow after work to study?