What is the STUFF function and how does it differ from the REPLACE function?

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STUFF function is used to overwrite existing characters. Using this syntax, STUFF
(string_expression, start, length, replacement_characters), string_expression is the string
that will have characters substituted, start is the starting position, length is the number of
characters in the string that are substituted, and replacement_characters are the new
characters interjected into the string. REPLACE function to replace existing characters of all
occurrences. Using the syntax REPLACE (string_expression, search_string,
replacement_string), where every incidence of search_string found in the string_expression
will be replaced with replacement_string.