Keeping internet sites up requires computing power.
The website needs to have enough machine/computer power to handle the loads of traffic. That’s why large companies like Google and Amazon have large digital warehouses with large machines.
The site would crash if there’s more internet activity than the computer power necessary to support it. Computing power costs money so smaller websites/companies can’t handle as much traffic as Google or Amazon etc.
Imagine you want to go to a restaurant, but the managers skimped on space and their wait staff so service isn’t all that great. As soon as they are full, they can’t let anyone else in and it might take the staff a long time to free up tables.
Now compare that to the well-run restaurant across the street that has a big seating area and the staff is very efficient at getting people in and out. They also have additional seating in case their main area is full, they can send customers to the additional seating area if necessary.
Same concept with websites. The servers that host the site need to have sufficient capacity and be able to handle enough traffic (by having additional servers and routing them based on traffic).
A website pretty much sends information to your web browser so it has to be able to handle that. If not, nothing is loaded in your browser because it never got anything to load.
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