diskutieren
to discuss
To have a conversation about a specific topic in which different opinions and arguments are exchanged.
Die Politiker diskutierten stundenlang über das neue Gesetz.
The politicians discussed the new law for hours.

to discuss
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to discuss
To have a conversation about a specific topic in which different opinions and arguments are exchanged.
Die Politiker diskutierten stundenlang über das neue Gesetz.
The politicians discussed the new law for hours.

The verb 'diskutieren' (to discuss) is usually used with two prepositions: You discuss 'über' (about) a topic (accusative) and 'mit' (with) a person (dative).
Wir haben mit den Nachbarn über den Lärm diskutiert.
We discussed the noise with the neighbors.
Make sure to always use the preposition 'über' with the accusative for the topic. A common source of errors is using the wrong preposition.
Die Studenten diskutieren über die Prüfungsergebnisse.
The students are discussing the exam results.
Common topics that people discuss are: a problem, a solution, a plan, the future, or politics.
Können wir später über deinen Plan für das Wochenende diskutieren?
Can we discuss your plan for the weekend later?
to talk
'reden' and 'diskutieren' can both mean that people talk about a topic. However, 'reden' is much more general and can refer to a simple conversation. 'diskutieren' is used when different opinions or arguments are exchanged. It sounds more goal-oriented and often a bit more serious. So you can talk about a vacation without really having a discussion. 'diskutieren' fits especially well when it is about a problem, a decision, or differing views.

Im Team diskutieren wir, ob das Projekt mehr Zeit braucht.
In the team, we are discussing whether the project needs more time.
Wir haben vor dem Termin über die neue Wohnung geredet.
Before the appointment, we talked about the new apartment.