Learn in the textbookEncoding and Character Codes
DefinitionShift_JIS Code (シフトJISコード) is a character code that moves the numbers of JIS double-byte characters such as kanji into ranges that do not overlap with single-byte characters.
ExplanationThe first byte of a double-byte character takes a value that single-byte characters do not use, so the value read shows whether a character is single-byte or double-byte. This makes documents mixing alphanumerics, half-width kana and kanji easy to handle, and it has been widely used for Japanese text on PCs such as Windows machines.
AnalogyPicture two kinds of goods on one shelf: if one kind's number tags are moved into a different color range, you can tell them apart by tag color alone, with no dividers.
Memory hookShift means to move over. The code numbers were shifted to a new place, hence Shift JIS.