The internet is the infrastructure most people use every day but few understand. At its core, the internet is a global network of interconnected computers that communicate using standardized protocols. Here is what happens when you type a URL into your browser and press Enter.
The Request Journey
Your browser asks a DNS (Domain Name System) server to translate the domain name (like google.com) into an IP address (like 142.250.80.46). Your computer sends the request to that IP address. The request travels through your router, to your ISP, through multiple network switches and routers, potentially across undersea cables, until it reaches the destination server.
Packets and Protocols
Data is broken into small packets for transmission. TCP (Transmission Control Protocol) ensures all packets arrive and are reassembled in the correct order. IP (Internet Protocol) handles addressing and routing. HTTP/HTTPS governs how web content is requested and delivered. Together, TCP/IP forms the foundation of internet communication.
Routing
Packets do not follow a single path. Routers at each network junction decide the best next hop for each packet based on network conditions. Packets from the same request may take completely different paths and arrive out of order. TCP reassembles them correctly at the destination.
DNS: The Internet's Phone Book
DNS servers form a hierarchical system. Root servers direct queries to TLD (Top-Level Domain) servers (.com, .org, etc.), which direct to authoritative servers that know the specific IP address. Your ISP caches DNS records to speed up repeated requests.
Undersea Cables
Over 95% of intercontinental internet traffic travels through fiber optic cables laid on the ocean floor. There are approximately 550 active cables spanning over 1.4 million kilometers. These cables carry data as pulses of light at nearly the speed of light.
Last Mile
The final connection from the ISP to your home is the last mile. This can be fiber optic (fastest), cable (coaxial), DSL (phone lines), fixed wireless, or satellite. The last mile is often the bottleneck that determines your internet speed.
Scale
The internet connects over 5 billion users and tens of billions of devices. Approximately 400,000 terabytes of data are transferred daily. This all works because every device follows the same protocols, creating a universal language for digital communication.
