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The information on the Internet is stored on the hard drives of web servers all over the world. Web servers are, at heart, ordinary computers just like yours.
In English, that means that the software listens for requests from web browsers (the software you're using to read this page right now!) and answers back with web pages, images, and other data.
The World Wide Web never "runs out of space"
because webmasters (people who have websites) are generally willing to pay for a website. And that means that people in the web "hosting" business have the cash to pay for more web servers if they need them.
In practice, web servers usually aren't exactly like your computer. For business reasons, they are usually built to fit into racks in "data centers" that have very fast connections to the rest of the Internet. This way, web "hosting" companies can achieve economies of scale by hosting many websites in one facility.
But there is no fundamental difference between your computer and a server in a rack at a web hosting facility. In fact, it is possible to run a website on your own computer at home, although that isusually not practical for serious websites.
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