Demarcation refers to the process of establishing boundaries or limits between different areas, concepts, or categories. This can apply to various fields, such as geography, where it defines the borders of countries or regions, or in science, where it distinguishes between different disciplines or theories. In philosophy, demarcation is crucial for differentiating between science and non-science, often referred to as the demarcation problem. This helps clarify what constitutes scientific inquiry and what does not, ensuring that scientific methods and principles are applied appropriately in research and discussion.