Estimating the number of deaths from violence or riots or looking at trends in drunken driving injuries by using math is the study of biostatistics. Using biostatistics, one can identify health trends that lead to saving of life measures through the application of statistics, techniques, and methods. Forecasting scenarios, identifying health trends within the community, explaining genetically phenomena, as well as determining the causes of disease and injury, biostatistics are an integral part of public health. Biostatistics is often utilized in par with epidemiology. Epidemiology has been explains  as “the study of the determinants and distribution  of health related states or events in specified populations and the appellations of this study to control of health problems .This undoubtfully says that epdidemiogists are concerned not only with death illness and disability but also with more positive health states with the means to improve health .The goal  of a study in epidemiology is usually a human population .A population can be defined in a geo graphical or other terms; for example a specific group of sick people  or coffee  factory workers could be the unit of study .A common population used in epidemiology is one in a given locality  or country at a given time . These terms are the base for defining subgroups with respect to sex, age ethnicity and so on. The structures of populations vary between geographical areas and time period. Epidemiological analysis has to take such diversification into account.

The air we inhale; the liquids we drink; the complex interactions between genetics and our surroundings. How do the built and natural environments influence our health and what  can we do to  reduce risk factors? These atmospheric risk factors can cause diseases such as asthma, cancer, and food poisoning. Specialists from chemistry, toxicology, engineering, and other areas combine their expertise to answer these important questions. Environmental health studies the impact of our surroundings on our body .Because environmental health is so broad in nature, it is often broken down in academic and professional settings in areas of contact and medians. These areas are quality of air, food protection, radiation protection solid waste management, hazardous waste management water quality and housing quality .It can be a bit more elaborated in terms of Global Health. Addressing health concerns from a global perspective and comprehending all areas of public health. International health professionals address health concerns among different traditions in countries worldwide. Globalization has linked our health closely to each other than ever before. The rapid movement of people and food across countries means that a disease can travel from a remote village to an urban hub at breakneck speed. Global public health meets the rising health challenges that cut across national boundaries. This international field embraces virtually all specializations in public health.

In public health it is mainly composed of the following core areas. It contains some varieties and discussed all the varieties as mentioned below .There are Behavioural Science/Health Education, biostatistics, emergency medical services, environment health,epidemiology, health services administration/management, international global health, and nutrition and public health practice and policy and let’s see the brief details about behavioural science and health education. The behavioral science and health education was defined as below: Stopping the overspread of sexually transmitted diseases, such as herpes and HIV/AIDS; helping youth recognize the dangers of drinking; and promoting seatbelt use. Behavioural Science/Health Education focuses on ways that encourage people to make proper choices. This includes the community-wide improvement of education programs that range from promoting healthy lifestyles in order to prevent disease, to researching complex health issues. Specialists motivate people to make healthy choices and develop educational programs that develop healthy lifestyles and prevent disease and injury. They also promote more efficient uses of health services, undertake self-care practices, and participate actively in the design and implementation of health programs. Some examples include mental health, aging, health promotion and disease prevention, public health practice, health education and behaviour change, disability and health, and social research. So these are the some brief details about behavioral science and health education.

Public Health is the method of protecting and improving the health of communities through education, promotion of healthy lifestyles, and research for disease and injury prevention. Public health professionals analyse the effect of genetics on health, personal choice and the environment in order to develop programs that protect the health of your family and community. Overall, public health is concerned with protecting the health of entire group of people. These populations can be as small as a locality, or as big as an entire country. Public health professionals try to prevent problems from occurring or re-occurring through implementing educational programs, developing policies, administering services, regulating health systems and some health professions, and conducting research, in contrast to clinical professionals, such as doctors and nurses, who focus primarily on treating people after they become sick or injured. It is also a field that is concerned with limiting health disparities and a part of public health is the fight for health care equity, quality, and accessibility. The field of public health is highly varied and contains many academic disciplines. The great positive impact of public health programs is widely admitted by the increase in the life expectancy of different countries such as USA, Japan and Germany.