The color. (Couldn’t resist). Red is beef, ostrich, etc. White is chicken, pork, etc.

Here's a nice article about it, which says, "Virtually all dietary studies categorize poultry and fish as "white meat" and four-legged land animals such as beef, pork and lamb as "red meat." Yet in culinary or cultural contexts, veal is often considered a white meat and duck or goose may be classified as red." So the distinction between the two may vary in certain cases. https://foodandnutrition.org/january-february-2013/color-confusion-identifying-red-meat-white-meat/

White meat is healthier than red meat as well. Less calories.

Red meat is cow or any mammal animal, white meat is usually chicken :D

hi from Iran