Memory cards are an important part of digital photography. Cards are rated by the speed at which they can transfer data from the camera buffer to the card. A faster transfer rate means you can shoot faster for a longer time before the camera warns you that it is busy and will not take any more images until enough space clears in the camera buffer. For casual snap shooting, speed is not as important as shooting action sports.
If your camera does video, then the faster card can be a big plus. With my 7d MK2 I have to use a high speed card for video, otherwise the clips are very short. With the high speed card I can shoot up to 30 minutes of video. So if you have tried shooting video with your DSLR, and your camera is telling you that video has been halted, after a very short time, check the card size and speed. The cards I use can record 120MB/second. These are the Sandisk Extreme cards.
Happy shooting
Dave
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