IntroductionThis work is part of my academic practice. The purpose of this study is to observe that language variation does not only depend on social and geographical origin but also changes depending on the action someone is performing. For example addressing students, writing lessons, giving religious speeches.Chapter Two2.1 Definition of registerThomas Bertram Reid was the first to use the term register for the first time in 1956. MAK Halliday states that register in sociolinguistics implies specific lexical and grammatical choices which are formulated by speakers based on the situational context, the participants in the conversation and the function of the language in discourse. (Halliday)MAK Halliday says there are two variations in language1) Dialect2) RegisterDialect focuses on social or regional variation where register is characterized by functional variation. These two terms are not completely independent of each other. Hudson states that “one man's dialect is another man's register.” This means that linguistic features that are part of one speaker's dialect might belong to a specific register of another speaker. Halliday, McIntosh, and Strevens (1964) put a lot of effort into the field of register in their work in 1964. They also called register as a variety according to usage. According to Trudgill (1983:101) linguistic register has been described asVarieties related to profession, occupation or topics known as register. For example, the medicine register is different from the mathematics register. The register of law and chemistry are different from each other. Usually register is characterized......middle sheet......engaged in) It is determined through who you are (socio-region of origin and/or adoption), Register is the way of saying different things and varies in semantics. In dialect we say the same thing in different ways and the dialect varies in phonetics, lexical grammar, phonology, but not in semantics. Chapter Three Conclusion: From the above discussion it is concluded that register is the situational variety and it is a non-literary variety. When the register changes, the meanings also change. It is the style of speech appropriate to the situation, level of formality, and the person being spoken to. It is also called situational dialect. The formal style is used for seniors, superiors and people you are not familiar with. The informal style is used for children, those of lower status and closed friends.