
das Echo
echo
The reverberation of sound that occurs when sound waves are reflected back from a surface and you hear the sound again.
In der großen Halle gab es ein beeindruckendes Echo.
There was an impressive echo in the large hall.
echo
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echo
The reverberation of sound that occurs when sound waves are reflected back from a surface and you hear the sound again.
In der großen Halle gab es ein beeindruckendes Echo.
There was an impressive echo in the large hall.

response
The reaction, resonance, or feedback that an action, statement, or work evokes in the public or in a specific group.
Der Film fand bei den Kritikern ein überwiegend positives Echo.
The film received a mostly positive response from critics.
In the literal sense, 'Echo' (echo) is often used with verbs such as 'hören' (to hear) or 'geben' (to produce/give). People speak of an echo 'in den Bergen' (in the mountains), 'in einem Tunnel' (in a tunnel), or 'in einer leeren Halle' (in an empty hall).
Als wir in die Höhle riefen, hörten wir ein lautes Echo.
When we called into the cave, we heard a loud echo.
You can recognize the figurative meaning 'Reaktion' (reaction/response) from the context. Typical signal words are 'Presse' (press), 'Medien' (media), 'Kritiker' (critics), or 'Publikum' (audience). This is not about sound, but about opinions and feedback.
Die Rede des Politikers löste ein geteiltes Echo in den Medien aus.
The politician's speech triggered a mixed response in the media.
In the figurative sense, 'Echo' (response) is often combined with adjectives such as 'positiv' (positive), 'negativ' (negative), 'breit' (broad/widespread), or 'schwach' (weak). Common verbs are 'finden' (to find/receive), 'bekommen' (to get), 'erhalten' (to receive), or 'auslösen' (to trigger).
Sein Vorschlag fand bei den Kollegen ein positives Echo.
His proposal received a positive response from his colleagues.
A common fixed expression is 'auf Echo stoßen' (to meet with a response). It means that an idea, proposal, or action evokes a reaction.
Ihre Initiative ist bei der Bevölkerung auf ein positives Echo gestoßen.
Her initiative met with a positive response among the public.
reaction
Both words can refer to the public response to a statement or action. Reaktion can also mean one specific response, whereas Echo tends to refer to the overall response something generates in the public. Use Reaktion for individual responses and Echo for the broader impact.

Seine Aussage stieß in der Öffentlichkeit auf ein breites Echo.
His statement met with a broad response from the public.
Auf seine Aussage gab es viele einzelne Reaktionen.
There were many individual reactions to his statement.