What is a transparency that allows the addition or retraction of information through superimposing films called?

The term that refers to a transparency allowing the addition or retraction of information through superimposing films is known as a multiple overlay. This method allows educators to present various layers of information on top of one another, making it easier to highlight different aspects of a topic without needing to create separate transparencies for each piece of information. This technique enhances visual learning by enabling students to see how different elements relate to one another in real-time, facilitating a more dynamic and interactive teaching experience. In contrast, the other terms may not specifically represent this capability of layering and adjusting information as effectively as multiple overlay does.