Ductal carcinoma is a type of breast cancer that begins in the ducts of the breast, which are the tubes that carry milk from the lobules to the nipple. It is the most common form of breast cancer, and it can be classified into two main types: invasive ductal carcinoma and ductal carcinoma in situ (DCIS). Invasive ductal carcinoma spreads beyond the ducts into surrounding breast tissue, while DCIS is non-invasive and remains contained within the ducts. Diagnosis typically involves imaging tests like mammograms and ultrasounds, followed by a biopsy to confirm the presence of cancer cells. Treatment options may include surgery, radiation therapy, chemotherapy, and hormonal therapy, depending on the stage and characteristics of the cancer. Early detection and treatment are crucial for improving outcomes.