Hello? Oh...Hello?

This may seem back-asswards, but for the sake of understanding, let's start this one off with a little computer analogy. Yes, chortle if you will, but this will all make sense in due course.

When shopping for a computer, there are several factors to bear in mind, most of which relate to performance. Just like cars, some computers will run faster than others. Some have more memory, allowing them to keep more information readily at-hand while working - much like a meat bag's human's short-term memory.