Ngoko is a form of the Javanese language spoken in Indonesia. It is considered the informal or casual register, used among friends, family, or people of the same age. Ngoko is characterized by its simpler vocabulary and grammar compared to more formal registers like Krama. In Javanese culture, the choice of language reflects social relationships and respect. Using Ngoko indicates familiarity and closeness, while switching to Krama shows politeness and respect towards elders or those in higher social positions. Understanding these language levels is essential for effective communication in Javanese society.