Immunizations are an essential component of modern medicine and are paramount for global health. This schedule of recommended immunizations may vary depending upon where you live, your child's health, the type of vaccine, and the vaccines available. Geographic location also contributes to variation in immunization schedules by country. The recommended immunization schedule is designed to protect infants and children early in life, when they are most vulnerable and before they are exposed to potentially life-threatening diseases. Vaccines contain weakened versions of a virus or versions that look like a virus (called antigens). This means the antigens cannot produce the signs or symptoms of the disease, but they do stimulate the immune system to create antibodies. These antibodies help protect you if you are exposed to the virus in the future. The following are some of the vaccines for children that are used globally.