A digital textbook versus a PDF on a screen

Many materials called digital are printed content moved to a screen. Students read, the teacher explains, and interaction ends with scrolling.

Three properties that make the difference

Digital material works when students can do something, the system responds to what they did, and the teacher sees the result without collecting notebooks.

• action: an exercise, code or simulation instead of reading only
• reaction: feedback while the student still remembers what they did
• visibility: class progress during the lesson, not a week later

What changes in practice

The teacher stops guessing who understood the topic. Instead of asking whether everything is clear, they can see which tasks were hard and for whom — which changes how the next lesson is run.