An index card is a small, rectangular piece of stiff paper or cardstock that is commonly used for organizing and storing information. They are typically used for writing down brief notes, definitions, or reminders, and can be easily organized in boxes or cardholders. Index cards are often used for study purposes, such as creating flashcards for memorization, or for keeping track of references in research. They are available in various sizes, with the standard size being 3 inches by 5 inches. Their compact size makes them portable and easy to handle.

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