zentral
central
Located in the middle or in the center.
Wir haben ein Hotel in zentraler Lage direkt am Hauptbahnhof gebucht.
We booked a hotel in a central location right by the main train station.

central
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central
Located in the middle or in the center.
Wir haben ein Hotel in zentraler Lage direkt am Hauptbahnhof gebucht.
We booked a hotel in a central location right by the main train station.

The adjective 'zentral' (central) is derived directly from the noun 'das Zentrum' (the center). So it always describes a quality related to a midpoint or core, whether geographically or thematically.
Der zentrale Platz der Stadt ist der Treffpunkt für alle.
The central square of the city is the meeting point for everyone.
In the figurative meaning of 'wichtig' (important) or 'wesentlich' (essential), 'zentral' (central) often appears in fixed collocations. Very common are 'eine zentrale Rolle spielen' (to play a central role), 'ein zentrales Thema sein' (to be a central topic), and 'von zentraler Bedeutung sein' (to be of central importance).
Die Digitalisierung ist ein zentrales Thema in der heutigen Arbeitswelt.
Digitalization is a central topic in today's working world.
The exact meaning of 'zentral' (central) can be understood from the accompanying nouns. Words like 'Lage' (location) or 'Platz' (square/place) point to the geographical center. Abstract terms like 'Frage' (question), 'Problem' (problem), or 'Rolle' (role) point to importance.
Die Wohnung liegt sehr zentral, nur fünf Minuten vom Bahnhof entfernt.
The apartment is very central, only five minutes from the train station.
important
'wichtig' and 'zentral' can both express that something has great importance. 'wichtig' is the general word and fits very often. 'zentral' means that something is at the center of a topic, plan, or problem. It sounds somewhat more objective and emphasizes this: without this point, you cannot really understand the matter or make progress. In everyday life, people usually say 'wichtig'. In texts, meetings, or explanations, 'zentral' fits when a point is the core of the matter.

Für die neue Strategie ist der Kontakt zu den Kunden zentral.
Contact with customers is central to the new strategy.
Bei der Wohnungssuche ist die Nähe zur Arbeit wichtig.
When looking for an apartment, being close to work is important.