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The primary difference, in non-technical terms, is that a 64-bit operating system is able to access more memory. A 32-bit operating system can only access up to 4 GB of RAM. Applications are steadily demanding more and more RAM. Even if you place more than 4 GB of RAM in your computer, you won't be able to use it with a 32-bit system. So to use the newest and greatest apps, you will eventually need a 64-bit operating system. A 64-bit operating system can access up to 16 exabytes (or 17.2 billion gigabytes) of RAM.

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