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And they save a lot of electricity. All they need is a computer. Online stores don't have a large number of clerks. The computer programs are the clerks. The programs can charge your credit card number and check you out.
The IP is the phone number. If one computer like to talk another, he will dial the number of the other computer. If the computer responds, then they established a connection, in other words, a phone call.
Internet was created in the 70s as a military project. It started as about 3 computers at that time. Right now there are millions of machines on the internet.
With the internet growing, we can do almost everything online. Has grandma been online yet? Probably yes. Grandma now can shopping online, playing games online or even date online.
Another advantage is the products can be exposed to a large number of potential customers. Suppose you live in a town with 10,000 people. This is not very small town in the US. You have something to sell but within the 10,000 people, only 0.01% people may be interested in your product.
Since more and more people are having their own sites. Not everybody would like to run a server. Actually it is not necessary to run a server for a business. Most online businesses have their store hosted in web hosting companies.
For most of your shopping, you don't need to pay the otherwise very expensive sales tax. You may need to pay the shipping though. But most of the time, the shipping cost less than the tax.
And say ye moreover, Behold, thy servant Jacob is behind us. For he said, I will appease him with the present that goeth before me, and afterward I will see his face; peradventure he will accept of me.
How does the internet work? Internet is like the phone networks. You pick up a phone and dial a number, the phone on the other side rings. The internet is the same thing. The phone now is the computer or anything with an IP.
Why should we shop online? Because for the same product, it is usually cheaper in online stores. Why the online stores can afford it? Because online stores don't necessarily have a big building for their store. So they save a lot of money for the real estate.
Now you go to the internet, there are billions of people there. The market is not hundreds or thousands bigger than it in the town. If the market is so big, the seller can afford to sell it for much less. That's how the internet offer us the products with lower costs.