
betonen
to emphasize
To highlight and underline the importance or significance of something through words or actions.
Der Firmenchef betonte die Notwendigkeit, Kosten zu sparen.
The company director emphasized the need to save costs.
to emphasize / stress
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to emphasize
To highlight and underline the importance or significance of something through words or actions.
Der Firmenchef betonte die Notwendigkeit, Kosten zu sparen.
The company director emphasized the need to save costs.

to stress
To highlight a syllable or word when speaking by making it louder or higher with the voice.
Im Deutschen betont man meistens die erste Silbe eines Wortes.
In German, you usually stress the first syllable of a word.
'Betonen' (to emphasize / stress) is an inseparable verb with the prefix 'be-'. The prefix is never separated from the verb stem, and the past participle is formed without 'ge-': 'betont'.
Er hat seine Worte sehr stark betont.
He stressed his words very strongly.
The object of the verb indicates the meaning. If you stress a 'Silbe' (syllable) or a 'Wort' (word), it is about pronunciation. If you emphasize a 'Notwendigkeit' (necessity) or an 'Aspekt' (aspect), it is about importance.
Kannst du mir zeigen, wie man dieses Wort richtig betont?
Can you show me how to stress this word correctly?
To highlight what is important, 'betonen' (to emphasize) is very often followed by a subordinate clause with 'dass' or an infinitive construction with 'zu'.
Die Lehrerin betonte, dass wir die Vokabeln lernen müssen.
The teacher emphasized that we have to learn the vocabulary.
to turn out / emphasize / put outside
Betonen and herausstellen both make something particularly important or visible. Betonen gives a point explicit weight, for example through a clear statement. Herausstellen brings a feature more strongly to the foreground, often as a particular advantage over other features.

Lea betont in ihrer Präsentation, dass das Gerät sehr leicht ist.
In her presentation, Lea emphasizes that the device is very light.
Lea stellt in ihrer Präsentation das geringe Gewicht als besonderen Vorteil heraus.
In her presentation, Lea highlights the device’s low weight as a particular advantage.