Lymphoma refers to a type of malignant tumor that originates in lymph nodes or extranodal tissues or organs. The cancer we usually talk about refers to malignant tumors originating from epithelial tissues, which we call cancer, such as lung cancer, liver cancer, etc. Therefore, lymphoma is actually what non-medical professionals commonly refer to as lymphatic cancer. It is simply called lymphoma instead of cancer because it originates in lymph nodes or extranodal tissues or organs, and therefore, it is termed malignant lymphoma, which in layman's terms is lymphatic cancer.