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End to End Encryption (E2EE) means that a message (either text or data, including video or audio) is encrypted by one user, then never decrypted again until it reaches other end users. This is less common as it requires a more advanced software platform to implement correctly, and although there are some communications apps which offer this benefit, most large scale video conferencing apps do not. Zoom uses encryption to encode messages from end users to their servers and back, but message data may not be encrypted through the entire process. This is a standard practice for most large-scale video conferencing apps due to the nature of how they functionare designed.
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