Brachytherapy is a form of radiation therapy used to treat cancer by placing a radioactive source directly inside or very close to the tumor. This method allows for a high dose of radiation to target the cancer cells while minimizing exposure to surrounding healthy tissue. It is commonly used for cancers of the prostate, breast, and cervix. The procedure typically involves inserting small seeds, wires, or capsules containing radioactive material into the body. Depending on the type of cancer and its location, brachytherapy can be delivered in a single session or over several treatments. This targeted approach can lead to effective treatment outcomes with fewer side effects.