What does sentence casing mean?

Sentence casing, commonly referred to as sentence case, is a standard capitalization convention used in writing, typography, and software design where only the very first word of a sentence, as well as any proper nouns, acronyms, or specific titles, begins with an uppercase letter while all other words remain in lowercase. This styling format mirrors standard punctuation rules found in everyday paragraph writing, making text feel natural, readable, and less visually cluttered compared to title case where every single principal word is capitalized. In digital design, graphic user interfaces, and content management systems, sentence case is frequently preferred for user interface buttons, form labels, and dropdown menus because it provides a clean, conversational tone that improves user experience and scanning efficiency.