The letter "S" is the 19th letter of the modern English alphabet. It is a consonant and is often associated with words like "snake," "sun," and "serpent." The uppercase form of "S" is represented as "S," while the lowercase form is represented as "s." It has a distinctive shape resembling a curve, making it easily recognizable. In typography, the letter "S" can be found in various fonts and styles, adding character and style to written text.