Patent classification is a system used to organize and categorize patents based on their technical content. This helps patent offices, researchers, and inventors easily find and access relevant patents. Different classification systems exist, such as the International Patent Classification (IPC) and the United States Patent Classification (USPC), each with its own set of categories and subcategories. By classifying patents, it becomes easier to identify trends in innovation and to avoid duplicating existing inventions. This system also aids in the examination process, allowing patent examiners to efficiently assess new applications against existing patents in the same category.