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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 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.
International mails even take weeks. Beside how fast emails are, emails saves a huge amount of paper, which in turn saves a lot of trees in the world. Maybe not a lot of people notice, but emails gave us more fresh air.
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.
Then thou shalt say, They be thy servant Jacob's; it is a present sent unto my lord and, behold, also he is behind us.
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.
