Statistics is the science of learning from data. It covers collecting, organizing, analyzing, interpreting, and presenting data. Descriptive statistics summarize data with means, medians, and graphs. Inferential statistics draw conclusions about populations from samples.

The field began with state record-keeping—hence the name—and grew through the work of Gauss, Pearson, Fisher, and others. Probability theory provides its mathematical foundation. Sampling, hypothesis testing, and regression are core tools.

Statistics is used in medicine, economics, sports, politics, and machine learning. It helps determine whether a drug works, whether a poll is reliable, and whether a pattern is real or due to chance. In an age of data, statistical literacy is increasingly essential.

• Science of collecting and analyzing data
• Descriptive and inferential branches
• Built on probability theory
• Used in medicine, economics, and machine learning