A technology consulting firm is guiding a client through the process of adopting AI-driven solutions for automating their business operations. The client is trying to understand the broader scope of artificial intelligence (AI) and how machine learning (ML) fits into it, particularly in terms of the distinct roles each plays in decision-making and problem-solving. Clarifying the relationship between AI and ML will help the client make informed decisions on which technologies to invest in. What is the key difference between machine learning and artificial intelligence?