With the optional end-to-end encryption in Zoom, your conversations are particularly secure against eavesdropping. This is how you activate the feature.
The popular video conference tool Zoom
Instead, Zoom only encrypts communication between its own cloud and the participants in a video conversation.
You are well protected against eavesdropping by third parties. However, there is still a theoretical risk of eavesdropping via the Zoom cloud, for example through security gaps or data misuse by Zoom itself.
In order to additionally protect your communication, you can optionally activate end-to-end encryption in Zoom. The entire data flow between the participants of a zoom call is encrypted directly.
The feature is still in the test phase and can only be used with the various Zoom apps and not with the Web-Version
For your safety you should be in Zoom also enable two-factor authentication.