What's the difference between a low-speed memory card and a high-speed card?

Generally, the transmission rate of low-speed cards is 2mb/s, while that of high-speed cards is above 60x, and a few cards can reach150x (1x =150kb/s). Some cards are marked on the label on the card surface, while others distinguish between high speed and low speed. Blue represents low speed and white represents high speed. Of course, it is good to buy a high-speed card, especially a large-capacity card above 5 12mb. When some cameras have strong continuous shooting function or need to take photos with pixels above 500w W, they need a high-speed sd card, so try not to buy a high-speed card too expensive. ....