Answers:
To make sure that you really are the card holder. A much larger percentage of credit card transactions over the phone are fraudulent compared to in person, so most merchants are required to get an imprint or run the actual card through a reader.
To verify and they have to run it through their. I have always had to do this.
Hotel usually asked for your cc, just to verify your id, and at the same time your cc acts as a security deposit, just incase you use the minibar or damage something within the hotel room. But don't worry, it is just a security, they will rip off all the cc details, if everything is satisfactory, when you leave the hotel.
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