Chemotherapy agents are medications used to treat cancer by targeting and killing rapidly dividing cells. These drugs can be administered in various ways, including intravenously or orally, and they work by disrupting the cancer cells' ability to grow and multiply. Different types of chemotherapy agents target specific types of cancer, and they can be used alone or in combination with other treatments. While chemotherapy is effective, it can also affect healthy cells, leading to side effects such as nausea, fatigue, and hair loss. The choice of chemotherapy agents depends on factors like the type of cancer, its stage, and the patient's overall health. Common classes of chemotherapy agents include alkylating agents, antimetabolites, and plant alkaloids.