Sentence case is a style of writing where only the first letter of the first word in a sentence is capitalized, along with any proper nouns. For example, in the sentence "The cat is sleeping," only the "T" in "The" is capitalized. This format is commonly used in everyday writing, including books, articles, and emails. Using sentence case helps improve readability and clarity. It allows readers to easily identify the beginning of a sentence without being distracted by excessive capitalization. This style is often preferred in professional and academic settings, as it maintains a clean and straightforward appearance in written communication.