How does a QR code image manage to "integrate" a lot of information into it so that it can be scanned by a cell phone?

This kind of code you are talking about is also divided into two kinds

1, directly through the layout rules of the picture, the text or character information edited into a QR code, scanning through the coding rules decode and read the information in the QR code. This can put 1800 characters, but there is a problem, the more characters, the QR code will be more dense, want to read out the QR code should be put very large.

2, cell phone scanning QR code, through the coding rules, read the information inside the QR code, this information is a URL link, through this link to enter a web page, view more content. There is no limit to the content that can be placed on this one, it can be text, images, video, audio, etc. The QR code is just an entry point to this URL.