How the Internet Works

The internet moves data by chopping it into small pieces called packets, sending them separately, and reassembling them at the other end, like mailing a book one page at a time in numbered envelopes. When you load a page, your message is split into packets. Each packet carries the destination address and its sequence number. Routers along the way read the address and pass each packet toward its target, and different packets can even take different routes depending on traffic. If one gets lost, only that page needs re-sending, not the whole book. Two layers make this reliable. IP handles addressing and delivery ('get this packet to that address'). TCP handles ordering and completeness ('put the pages back in order and ask again for any missing ones'). Splitting the job this way is why the internet is robust: no single path or machine is essential.