begeistern
to inspire
To create great joy, enthusiasm, or admiration for something in someone.
Mit seiner Rede konnte er das gesamte Publikum begeistern.
With his speech, he was able to inspire the entire audience.

to inspire / enthuse
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to inspire
To create great joy, enthusiasm, or admiration for something in someone.
Mit seiner Rede konnte er das gesamte Publikum begeistern.
With his speech, he was able to inspire the entire audience.

The verb 'begeistern' is related to the noun 'der Geist' (spirit/mind). Literally, it means to breathe 'spirit' or 'liveliness' into someone and thus awaken enthusiasm.
Seine Ideen haben eine ganze Generation begeistert.
His ideas inspired an entire generation.
There are two important sentence patterns: 'Etwas begeistert jemanden' (something inspires someone / excites someone) and 'Jemand begeistert sich für etwas' (someone becomes enthusiastic about something). Pay attention to the difference between the accusative object and the reflexive form with 'für'.
Der Film hat mich total begeistert.
The film totally inspired me.
The past participle 'begeistert' is very often used as an adjective, often in the fixed phrase 'begeistert sein von etwas (Dativ)' (to be enthusiastic about something).
Die Kritiker waren von dem neuen Album begeistert.
The critics were enthusiastic about the new album.
The prefix 'be-' is inseparable. It remains firmly attached to the verb stem in all conjugated forms and sentence positions.
Er versucht, seine Schüler für das Thema zu begeistern.
He tries to get his students excited about the topic.
to look forward / to be pleased
'freuen' and 'begeistern' both have to do with positive feelings. 'freuen' is more general and fits many everyday situations: you can be pleased about a message or look forward to a meeting. 'begeistern' is stronger. It means not only joy, but also great interest, energy, or admiration. Something can inspire someone, or you can be enthusiastic about something. If the feeling is simply pleasant, 'freuen' sounds more natural. If someone is really swept up by something, 'begeistern' fits better.

Wir begeistern uns gerade sehr für das Fotografieren.
We are really enthusiastic about photography right now.
Das Kind freut sich, weil der Termin beim Arzt gut verlaufen ist.
The child is happy because the doctor's appointment went well.