A population refers to the entire group of individuals, objects, or events of interest in a particular study, while a sample is a smaller group or subset of the population that is selected to represent the larger group in a study. The main difference between a population and a sample is the scope of the measurement or observation. When data is collected from every member of a population, it is called a census, and when data is collected from only a portion of the population, it is called a sample. Samples are often used in research because it can be impractical, costly, or impossible to gather data from the entire population, so a representative sample is chosen to provide accurate insights into the population as a whole.
### Instruction:
Explain the main difference between a population and a sample.

### Response:
