Per-Cpu utilization

Per-Cpu utilization I have read terms such as per-cpu utilization. Don't we have just one cpu in our machines ? Also there are two directories cpu0 and cpu1 in the sub-directory /sys/devices/system/cpu ... Do I have two cpus in my machine ?
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Guest [Entry]

Having a dual (or quad) core is talking about the number of processors on the physical chip. So you actually DO have two processors in there, but only one physical unit. Some computers have many chips with many cores each. Then the number of processors would indeed be chips * cores.