Sample data refers to a subset of data selected from a larger dataset, used for analysis or testing purposes. It helps researchers and analysts understand trends, patterns, or behaviors without needing to examine the entire dataset. For example, in a study about consumer preferences, a researcher might use sample data from a smaller group of participants to draw conclusions about the larger population. Using sample data is essential in various fields, including statistics, market research, and machine learning. It allows for quicker analysis and can reduce costs and time associated with data collection. Proper sampling techniques ensure that the sample accurately represents the larger dataset, leading to more reliable results.