Some of us are visual learners. No amount of words will trigger the "aha!" button like illustrations. Well, our friends at Lexar have put together a cool vid that shows how images go from capture to memory card in your digital camera.
Write speed? Read speed? Transfer rate? 400x? 64x? 32GB? Start talking about this sort of stuff with non-photo-geeks and watch how fast their eyes glaze over. But the fact is, understanding how images travel through a camera from the instant of image capture until they are added to the camera's memory card can help you figure out what kind of memory card you need.
Lexar has put together a nice little jargon-free video that illustrates this process, complete with Star Wars sound effects incongruously layered over some smooth jazz. Watch and enjoy this short video, and, maybe you'll learn something new!
What the video doesn't talk about is what transfer speed is appropriate for different kinds of cameras. Here's an article that goes into more depth. (Sorry, I had to use words...)