Learn in the textbookTypes of Standards and Code Systems
DefinitionA QR code (QRコード) is a two-dimensional code (二次元コード) that represents data with black and white dots laid out both vertically and horizontally inside a square.
ExplanationBecause the data covers the whole area, it can hold thousands of digits and handle letters and kanji as well. Even if part of it is dirty or missing, an error-correction mechanism can restore the original data.
AnalogyCompared with a memo box that has a single line, squared manuscript paper of the same size holds far more characters.
Memory hookQR stands for Quick Response, so the name itself says it is meant to be read quickly.