What is the difference between intracranial tumor radiotherapy and chemotherapy?

In clinical practice, there is a difference between radiotherapy and chemotherapy for intracranial tumors. Radiotherapy is a kind of ray that irradiates the affected area to achieve a certain degree of tumor cell necrosis. Chemotherapy is the use of drugs that interrupt the metabolic stage of tumor cells and prevent them from growing. This is the difference between chemotherapy and radiotherapy.