HTTP vs HTTPS: Why the S Matters
The difference is the "S" for Secure: HTTP sends web traffic in plaintext (anyone intercepting reads everything), while HTTPS encrypts it with TLS — protecting passwords, payments and privacy. HTTPS is now the standard for essentially all websites.
Side by side
| Factor | HTTP | HTTPS |
|---|---|---|
| Encryption | None (plaintext) | TLS-encrypted |
| Port | 80 | 443 |
| Security | Readable if intercepted | Protected |
| Browser indicator | "Not secure" warning | Padlock icon |
| Use today | Legacy/internal only | Standard everywhere |
The details that matter
HTTP was fine when the web was mostly public documents, but any login, payment or private data sent over it is readable by anyone on the path. HTTPS wraps HTTP inside TLS encryption — the browser and server negotiate a secure channel (using both asymmetric and symmetric encryption) before any data flows. The padlock confirms the connection is encrypted and the server's certificate is valid. Google now flags plain HTTP as "Not secure" and ranks HTTPS sites higher, which is why HTTPS is effectively universal. It runs on port 443 vs HTTP's port 80. Understanding this is basic security and web literacy.
Frequently asked questions
What is the difference between HTTP and HTTPS?
HTTP sends web traffic in plaintext; HTTPS encrypts it with TLS, protecting passwords, payments and privacy. HTTPS uses port 443, HTTP uses port 80.
What does the padlock icon mean?
The connection is encrypted with HTTPS/TLS and the site's certificate is valid — data exchanged can't be read by interceptors.
Is HTTP still used?
Rarely on the public web — browsers flag it as 'Not secure' and search engines favour HTTPS. HTTP survives mainly for legacy or internal systems.
Related articles
Want hands-on training?
Learn this on real Cisco lab devices with placement support at Attila Technologies, Ahmedabad.