Red, green, and blue cards

Quick answer：

The term 'red, green, and blue cards' could refer to various contexts. It might be related to a specific card game, a color-coding system, or a type of identification card. For instance, in some card games, red and blue cards are used to represent different teams or players. In color coding systems, red, green, and blue are primary colors often used to signify different categories or statuses. In the context of identification cards, these colors might be associated with different types of cards issued by governments or organizations. Without more context, it is difficult to provide a precise explanation.