HTTPS
HTTP secured with TLS encryption, running on port 443 for safe web browsing.
HTTPS is HTTP layered over TLS (Transport Layer Security), which authenticates the server via a digital certificate and then encrypts traffic between browser and server. The handshake establishes a symmetric session key, so captured packets remain unreadable. Port 443 is the well-known TCP port for HTTPS; port 80 carries unencrypted HTTP.
The exam distinction worth noting is that HTTPS verifies the server and encrypts the channel, but does not verify the identity of the user. A browser padlock means the connection is encrypted, not that the site is trustworthy — a common point of confusion on scenario questions.
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