Dual and quad-core processor options are common options on many computers, both desktops and laptops. Generally speaking, what processor suits you best depends on your intended use of your computer. If you're into PC or online gaming, you'll want a more powerful processor. However, if all you do is type documents, surf the Web and look at streaming videos, you probably don't need to spend the extra money.
Dual Core
A computer with a dual core processor has two CPUs, or central processing units, that carry out the complex computations your computer runs. If you've ever looked at your task manager window and clicked the "Processes" tab, you've likely seen a long list of programs that are running in the background whenever your computer's booted up. This holds true no matter what operating system you run. Keep in mind that a dual core processor requires computer programmers to write their programs with it in mind for optimal efficiency.
Quad Core
If your computer has a quad core processor, you may guess that it's got four CPUs -- and you'd be right. However, this is not necessarily a case of "more equals better." Overall speed of your processor, no matter the type, is expressed in GHz, or gigahertz. This number is the overall speed of the entire processor, not of each core operating individually. Therefore, it's possible for dual and quad-core processors both running at the same speed to produce roughly the same performance.
Considerations
There's no denying that a quad-core processor has greater computational capability than a dual-core processor. However, programmers have to take advantage of that capability when writing programs in order for it to matter to you as a user. The truest arbiter of any processor -- dual, quad, or otherwise -- is how it performs in benchmark testing. As the name suggests, benchmarks provide a "yardstick" that shows you, in simple terms, how processors or different computer configurations perform. PassMark Software's "CPU Benchmark Charts" website regularly updates with current information on CPU benchmarks. If you're considering buying a new computer or upgrading an old one, check there for the latest information.
Caution
Any processor of any size needs adequate cooling available to function properly. If you're considering upgrading your existing computer's performance, don't forget to cool your speedy new processor of choice. Keep in mind that one of the reasons processor manufacturers moved away from single-core processors is that, as their speed increased, they became hotter and hotter. Dual and quad-core processors with reduced speeds simply don't get as hot as single-core processors running at higher speeds. If you're looking at laptops equipped with multicore processors, read reviews to learn about how well their cooling systems work. Laptops cram a lot into a tiny space, and some get hotter than others. This can be problematic when the vents are on the bottom, particularly if you actually use your laptop on your lap.
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