A processor or central processing unit (CPU), is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logic, controlling, and input/output (I/O) operations specified by the instructions.
A multi-core processor is a computer processor integrated circuit with two or more separate processing units, called cores (aka: physical cores), which each read and execute program instructions, as if the computer had several processors.
Some CPUs can virtualize two cores for every one physical core that’s available, a technique known as Hyper-Threading (aka: logical processors). For example, if your CPU has 6 physical cores, it will show as having 12 logical processors with Hyper-Threading.
The clock speed of a processor is the number of instructions it can process in any given second, measured in gigahertz (GHz).
See also: Windows Processor Requirements | Microsoft Docs
This tutorial will show you different ways to check what processor or CPU is in your Windows 7, Windows 8, and Windows 10 PC.