How many kb of data fit into a QR code and why this is important?

How many kb of data fit into a QR code and why this is important?

The amount of data that can be stored in a QR code depends on the size and error correction level of the QR code, as well as the type of data being encoded. In general, a QR code can store up to 7,089 numeric characters, 4,296 alphanumeric characters, or 2,953 bytes...