What is a L2 cache and what is the difference between the various types??

I purchased a new laptop that has has a 2.0ghz dual core processor with a 4mb L2 cache. What the heck is the difference with the 4mb cache compared to something like a 2mb cache. There are similar questions that were posted but the responses to them are written in extremely wordy ways. I am not the sharpest person when it comes to computer terms, so keep the responses short, sweet, and understandable. Thanks!!

Answers:
the amount of space available on the chip for instruction sets, it doesn't have to go to ram or the hard drive to get the instaructions so its faster.. a p3 had a 512kb cache and a celeron had a 128 kb cache yet the processor was the same except for this but the pentium costs more because of the increase in performance
Basically it is the space that your processor has to help do it's job. The more it has the more that it can juggle. That is as basic as I can keep it.

If you don't know the terms then it's not something you should even worry about.
There is L1 and L2 cache and the L stands for level. L1 is faster than L2. The difference between 4mb L2 cache and 2 mb L2 cache is the amount of data that can be stored in cache. The more data your cache can hold the quicker your processor can run because it does not have to wait for data to be pulled from RAM , which is much slower than cache.

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