SSL VPN and HTTPS relation?

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It might be just a weird question but i wonder something. SSL VPN is a
type of remote access VPN method which allows users to connect remotely and making a secure connection over Internet without installing a VPN client software.HTTPS is the secure HTTP protocol running at application layer.

However, when i visited an authentication page on the Internet, URL turns
into https from http. At that time, is the only thing that changes during data
encapsulation process the https protocol instead of http?

So, how am i able to separate SSL VPN from this https?