ARCS, which stands for Attention, Relevance, Confidence, and Satisfaction, is a model of instructional design used to create engaging and effective learning experiences. It focuses on capturing learners' attention, making the content relevant and meaningful to them, building their confidence in their ability to learn, and ensuring they feel satisfied and motivated to continue their learning journey. The ARCS model helps instructional designers design learner-centered materials that promote active engagement and improve learning outcomes.