Overview
Science is the systematic endeavor to understand the natural world by making observations, forming explanations, and testing them. The term refers both to a process and to the organized body of reliable, evidence-based knowledge that results. Scientific inquiry draws on a range of disciplines and formal tools to describe patterns, explain causes and predict outcomes.
Major branches
The traditional natural sciences study different aspects of nature: chemistry examines substances and their transformations, biology studies living organisms, geology investigates Earth and its materials, astronomy observes celestial objects, and physics focuses on matter, energy and fundamental forces. Complementary formal disciplines such as mathematics and logic provide methods for modelling, quantifying and reasoning about scientific claims. Many modern problems require interdisciplinary approaches that combine methods and insights from multiple fields.
Methods and the scientific method
Scientific work typically follows a pattern often called the scientific method: posing a focused question, proposing a hypothesis or model, designing a study or experiment, collecting data, analysing results and drawing conclusions. Central to this approach are careful observations, quantification and reproducible experiments. Good practice documents procedures and uncertainties so others can evaluate and repeat the work.
Research, scientists and testing
Organized inquiry is usually described as research, and individuals who conduct it are called scientists. Research ranges from theoretical analysis to laboratory experiments and field studies. Results are subjected to scrutiny through methods such as peer review, replication and independent tests, which help separate robust findings from errors or biases.
History and development
The institutions and methods of science developed over centuries from earlier natural philosophy and crafts. Key changes included the adoption of controlled experiments, quantitative measurement and the establishment of shared communication channels like scholarly journals and societies. These developments have made cumulative, public progress possible: theories are refined in response to new data and better explanations replace older ones when warranted.
Applications and societal importance
Scientific knowledge underpins technologies, medicine, environmental management and many aspects of daily life. Applied research translates basic discoveries into tools, processes and policies. Interactions between science and society raise practical questions about risk, priorities and implementation; effective use of scientific findings typically requires communication between researchers, decision makers and the public.
Limitations, ethics and quality assurance
Science differs from other ways of knowing by emphasising empirical testing and logical inference, but it has limits. Scientific conclusions are provisional and subject to revision as new evidence appears. Ethical standards, transparency, reproducibility and peer review are mechanisms used to reduce error and misuse. Awareness of uncertainty and clear communication of confidence are important aspects of rigorous scientific practice.
Organization of knowledge and education
Scientific results are organized into concepts, laws and theories that summarise understanding at different scales. Education and training in scientific thinking teach methods of observation, measurement and critical assessment so that new generations can extend and apply the existing knowledge base. Ongoing research continually updates what is known and how best to investigate unanswered questions.