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The tutorial introduces how to solve letter combinations of a phone number by giving a string of digits containing only numbers 2 through 9. The goal is to return all possible letter combinations that the number could represent. Each number on the phone keypad is mapped to specific characters (e.g., 2 to ABC, 3 to DEF). Different numbers are mapped to different numbers of characters (e.g., 7 to 4 characters, 9 to 4 characters). The tutorial explains this mapping process and how to generate all possible letter combinations for a given string of digits.