Quad-core is leading-edge computing power, very fast and of course more expensive than single or dual-core processors. Is about the highest-performing processor that one can get in a desktop computer these days.
A quad-core processor has four cores; before Quad-core, is called a dual-core, two-core processor. In a multi-core processor, two or more cores are wired together so that they process instructions cooperatively.
Bascally, a "core", is part of a central processing unit (CPU) that reads and executes program instructions; while other parts of the CPU get instructions into and results out of the core. CPUs were originally developed with just one core. But in search of ever faster processing, chip makers developed CPUs that have multiple cores.
Quad core processors are used in highly profitable applications because they are not cheap to buy; e.g. are used in high-end gaming machines; video processing workstations; computer-aided design (CAD) applications; statistical modeling; working with very large database files; and in other extremely calculation-intensive applications.
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