What is 2D barcode?

We usually use one-dimensional bar code in supermarkets, which is simple to understand that it only records data horizontally

While the two-dimensional bar code is square, it can record data horizontally and vertically at the same time, that is to say, it can

Record more data

Now, two-dimensional bar code is commonly used in countries such as South Korea, Japan and so on, and China is still in the initial stage

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