This book is a concise yet insightful exploration of the various types of lines employed in the art of calligraphy across cultures and styles. The book introduces readers to foundational line forms such as horizontal, vertical, diagonal, curved, and broken lines, illustrating how each contributes to the structure, rhythm, and elegance of calligraphic writing. Through historical context and visual examples, the book demonstrates how line dynamics shape aesthetic expression in scripts such as Arabic, Latin, Chinese, and Persian. Ideal for beginners and enthusiasts, it also delves into the tools and techniques calligraphers use to control line quality. Whether used for spiritual expression or artistic decoration, lines are revealed as the essential backbone of calligraphic beauty.