This article explores the use of the syllable "TSU" in Japanese, which is used to add emphasis or act as a pause between words and phrases. It has been used for centuries and is still commonly used today. While it may not be pronounced aloud by native speakers, its presence still carries meaning and provides emphasis when added onto words appropriately during conversations. Examples of how it can be used in conversation are provided, as well as common mistakes that should be avoided when using TSU in Japanese.