what is 3x5 index card

A 3x5 index card is a card stock cut to a standard size of 3 inches tall by 5 inches wide (76.2 by 127.0 mm) . It is a small card used for recording and storing small amounts of discrete data, and is commonly used as an organizational tool for creating an index for expedited lookup of information. Index cards are available in blank, ruled, and grid styles in a variety of colors. They are used for a wide range of applications and environments, such as recording and storing recipes, shopping lists, contact information, presentation notes, project research and notes, and bibliographical citations or notes in a card file. They are also used in schools as flash cards or other visual aids.