SpellingCorrection is an option for StringMatchQ, Names and related functions which specifies whether strings should be considered to match even when a small fraction of the characters in them are different.
The default setting SpellingCorrection -> False requires exact matching.
?name effectively uses SpellingCorrection -> True when it cannot find an exact match for name.
SpellingCorrection is an option for StringMatchQ, Names and related functions which specifies whether strings should be considered to match even when a small fraction of the characters in them are different. 
![[ja]](/common/images2003/lang_bottom_ja.gif)