## "Click and a Page Opens" Wasn't Always Obvious
Click on blue text and you jump to another page. We do this dozens of times a day without thinking, but it all works thanks to an incredible invention. That invention is called the "hyperlink." It's so commonplace now that we barely notice it, but without hyperlinks, the internet as we know it wouldn't exist.
## The Difference Between a Book Index and a Hyperlink
Think about the index at the back of a book. If it says "Internet - page 42," you flip to page 42 yourself. A dictionary's "see also" works the same way - you have to turn the pages yourself.
Hyperlinks eliminated that effort entirely. With just a click, you can jump to any page anywhere in the world. And from that page, you can follow another link to yet another page, and then another - you can keep tracing information endlessly.
A book index can only guide you within the same book, but a hyperlink can guide you to any page in the entire world. That difference was revolutionary.
## Tim Berners-Lee's Invention
In 1989, British scientist Tim Berners-Lee was working at CERN, a European research organization. He wanted a system that would let researchers around the world easily share papers and documents. What he built was the World Wide Web (WWW).
He designed three key components.
- HTML: Rules for writing pages. It lets you mark parts of text as "this is a link" - URL: Rules for writing page addresses. It assigns a unique address to every page in the world - HTTP: Rules for delivering pages. It's the protocol that lets browsers and servers communicate
With these three pieces working together, documents stored on computers around the world could be connected with a single link.
What's especially remarkable is that Berners-Lee chose not to patent his invention and made it free for everyone to use. If he had patented it and charged licensing fees, we might never have reached a world where anyone can freely create websites. His decision was a driving force behind the explosive growth of the internet.
## How Links Connect the World
At its core, a hyperlink is a "bridge between pieces of information."
A blog post written by a student in Japan can link to a research paper at an American university. That paper links to a British newspaper article. The newspaper article links to Australian government statistics. In this way, information from around the world is woven together like a spider's web.
The name "Web" comes from exactly this spider's web-like structure. Every time someone creates a new link, this enormous web grows just a little bit bigger.
## The Problem of Broken Links
However, links have a weakness: "broken links" (dead links).
When a linked page is deleted or its URL changes, clicking it shows a "404 Not Found" error. The bridge has collapsed.
Some studies suggest that roughly half of the links on web pages from 10 years ago are now broken. Bridges that connect information will decay if left unattended. This is one of the web's biggest challenges.
## Short URLs and Link Lifespans
Short URLs are convenient, but they require caution when it comes to link lifespans.
A short URL works by routing through the shortening service's server to redirect you to the destination. This means if the shortening service goes down, the redirect stops working. If the service shuts down entirely, every short URL it created becomes a broken link.
In fact, some URL shortening services have shut down in the past, and millions of links became useless overnight. A short URL is a bridge that only works "as long as the service keeps running."
For important links, don't rely solely on short URLs - keep a record of the original URL too. For report references and important bookmarks, always save the full, original URL.
## Summary
The hyperlink was a revolutionary invention that connects information to information with a single click. It brought us a level of convenience far beyond book indexes or dictionary cross-references, weaving the world's knowledge into a vast web.
However, links don't last forever. Understanding the risks of broken links and URL shortening service shutdowns will help you use links wisely.
If you want to learn more about the history of the web, books about internet history on Amazon are a great read.