"क" is the first letter of the Hindi alphabet, known as देवनागरी. It is pronounced as "ka" and represents a voiceless velar plosive sound. In the Hindi language, "क" is used in various words and plays a crucial role in forming syllables. In addition to its phonetic significance, "क" is also used in mathematics and science to denote constants or variables. It is a fundamental character in many languages that use the देवनागरी script, making it essential for communication and literacy in regions where Hindi and related languages are spoken.