What is science in 20 words?

Science is the systematic study of the natural world through observation, experimentation, and analysis to understand how things work.

This concise definition captures the essential elements that distinguish science from other human activities: its systematic nature (following organized methods rather than random exploration), its focus on the natural world (studying phenomena that can be observed and measured), and its reliance on empirical methods (observation and experimentation rather than pure speculation or tradition).

The phrase "how things work" encompasses both descriptive science (cataloging and describing natural phenomena) and explanatory science (developing theories about underlying mechanisms and causes). This definition emphasizes that science is fundamentally about understanding—not just collecting facts, but comprehending the patterns, relationships, and principles that govern natural processes.

While this twenty-word definition necessarily omits many important aspects of science (such as its collaborative nature, self-correcting mechanisms, and practical applications), it effectively communicates the core concept to audiences who need a quick, clear explanation. The definition works well for educational purposes, public communication, and as a starting point for deeper discussions about scientific methodology and philosophy.

This succinct explanation serves as an excellent foundation for expanding into more detailed discussions about specific scientific fields, methods, or applications, making it particularly valuable for educators, science communicators, and anyone who needs to explain science clearly and concisely to diverse audiences.