B-Cell Lymphoma is a type of cancer that originates in the B-cells, which are a crucial part of the immune system. These cells are responsible for producing antibodies that help fight infections. When B-cells become cancerous, they can grow uncontrollably, leading to tumors in lymph nodes and other tissues. There are several subtypes of B-Cell Lymphoma, including Diffuse Large B-Cell Lymphoma and Follicular Lymphoma. Symptoms may include swollen lymph nodes, fever, weight loss, and night sweats. Diagnosis typically involves blood tests, imaging studies, and a biopsy to confirm the presence of cancerous cells.