"John is smarter than" can be used to compare John's intelligence to that of another person or group. This phrase suggests that John has a higher level of understanding, problem-solving skills, or knowledge in a specific area. For example, if John is compared to his classmates, it implies that he performs better academically or grasps concepts more quickly. In various contexts, such as school, work, or sports, saying "John is smarter than" can highlight his ability to think critically or make informed decisions. This comparison can motivate others to improve their skills or encourage collaboration, as they may seek to learn from John's strengths.