Critical thinking is defined as disciplined, clear, rational, and evidence-based thinking. It involves assessing the validity and worth of convergent and non-convergent thinking. Critical thinking is important for success in higher education and careers as it allows students to better understand various viewpoints, analyze circumstances, and evaluate information from credible sources which improves problem solving skills. In the 21st century, critical thinking plays an important role in effective student learning through asking questions, developing solutions, and effective communication. It also enables effective teaching by engaging students with fundamental concepts through examples.