aufschlussreich
informative
The quality of something that provides new insights, information, or a better understanding.
Das Gespräch mit der Expertin war sehr aufschlussreich.
The conversation with the expert was very informative.

informative
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informative
The quality of something that provides new insights, information, or a better understanding.
Das Gespräch mit der Expertin war sehr aufschlussreich.
The conversation with the expert was very informative.

The word consists of 'Aufschluss' (information or insight) and the ending '-reich' (rich in / full of). 'Aufschluss' means information or insight, from 'aufschließen' (to unlock, like a door), and '-reich' means 'full of'. So something is 'aufschlussreich' (informative) when it is full of insights.
Die Analyse der Daten lieferte einen wichtigen Aufschluss über das Kundenverhalten.
The analysis of the data provided an important insight into customer behavior.
This adjective often describes things that convey knowledge or information. Typical nouns are 'Gespräch' (conversation), 'Erfahrung' (experience), 'Studie' (study), 'Ergebnis' (result), or 'Dokument' (document).
Die Studie lieferte aufschlussreiche Ergebnisse zur Luftqualität.
The study provided informative results on air quality.
'Aufschlussreich' (informative) belongs to a somewhat elevated or formal style of language. It is often used in written texts, reports, or educated conversations.
Ihre Präsentation war äußerst aufschlussreich und gut strukturiert.
Her presentation was extremely informative and well structured.
interesting
'interessant' and 'aufschlussreich' can both fit for conversations, reports, or experiences. 'interessant' means that something is engaging or arouses curiosity. 'aufschlussreich' means more specifically that it helps you understand something better or gives you new, important information. The words can be confused because an informative report is often also interesting. If you only mean attention, 'interessant' fits. If you want to emphasize that something explains something or brings clarity, 'aufschlussreich' is more precise.

Bei der Arbeit ist das Gespräch aufschlussreich, weil wir die Fehler besser verstehen.
At work, the conversation is informative because we understand the mistakes better.
Der Film über alte Berufe war in der Schule interessant.
The film about old professions was interesting at school.