The "Alphabet Series" is a common type of puzzle or sequence found in various competitive exams and brain teasers. In this series, letters of the alphabet are arranged in a specific order or pattern, and the challenge is to identify the next letter or complete the sequence based on the given clues. These puzzles often involve simple patterns, such as skipping letters, reversing the order, or following a numerical sequence based on the position of letters in the English alphabet. Solving these puzzles can enhance logical reasoning and pattern recognition skills, making them popular in educational settings.