die Kreation
creation
The result of a creative process; a created work, especially in fashion, art, or cuisine.
Der Modedesigner präsentierte seine neueste Kreation auf dem Laufsteg.
The fashion designer presented his latest creation on the runway.

creation
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creation
The result of a creative process; a created work, especially in fashion, art, or cuisine.
Der Modedesigner präsentierte seine neueste Kreation auf dem Laufsteg.
The fashion designer presented his latest creation on the runway.

'Die Kreation' belongs to the word family of the verb 'kreieren' (to create something). The ending '-tion' is typical for feminine nouns derived from verbs that describe a process or its result.
Der Künstler wollte mit seinem Werk etwas völlig Neues kreieren.
The artist wanted to create something completely new with his work.
The word 'Kreation' is often used in an elegant or artistic context. It is typical of the fields of fashion, fine dining, and art.
Der Sternekoch servierte uns eine exquisite Kreation aus Fisch und Gemüse.
The Michelin-starred chef served us an exquisite creation made of fish and vegetables.
You can recognize the meaning by whether the word is countable. If the result is meant, the word is countable ('eine Kreation' — a creation, 'viele Kreationen' — many creations). If the process is meant, it is usually uncountable and appears in the singular.
Diese neue Eissorte ist eine wunderbare Kreation.
This new ice cream flavor is a wonderful creation.
development
'die Entwicklung' and 'die Kreation' can both have to do with something new coming into being. 'die Entwicklung' usually emphasizes the longer process: you plan, test, and improve something, for example a product or an idea. 'die Kreation' sounds more creative and often refers to a special result, for example in fashion, art, or cuisine. The words can be confused when something new is being created. A practical rule: for technology, concepts, and long work processes, 'Entwicklung' often fits better; for a created work or a creative idea, 'Kreation' sounds more natural.

Nach der Arbeit zeigte der Koch seine neueste Kreation mit frischen Kräutern.
After work, the chef showed his latest creation with fresh herbs.
Die Entwicklung der neuen App dauert länger als geplant.
The development of the new app is taking longer than planned.