Cancer actually refers to malignant tumors. Malignant tumors are named differently based on their site of origin. For example, those originating from epithelial tissue are called carcinomas, such as lung cancer, liver cancer, colon cancer, etc. Lymphoma refers to a malignant tumor originating from lymph nodes or tissues or organs outside the lymph nodes, which we call lymphoma. There are also some malignant tumors originating from mesenchymal tissue, which we call sarcomas. Therefore, lymphoma is also a malignant tumor and is considered a type of cancer.