Cancer is one of the leading causes of death worldwide, responsible for about 25% of deaths. There are over 100 types of cancer that can affect people of all ages, with risk increasing with age. Approximately 90-95% of cancer cases are caused by environmental and lifestyle factors like smoking, poor diet, obesity, infections, radiation, and pollution rather than genetics. Cancer occurs when cells divide uncontrollably due to abnormalities in their genetic material. More than 30% of cancers are preventable by avoiding risk factors within one's control such as smoking, diet, exercise, alcohol, and infections.