What is the difference between calculating standard deviation of a population versus a sample?

What will be an ideal response?

When calculating standard deviation the ideal scenario would require all data from the entire group in question. In many situations this not possible, for example calculating the standard deviation of age for a city. Acquiring all information from every inhabitant would be difficult. When faced with this situation, statisticians often take a sample of the entire population to perform calculations. In Excel the function STDEV.S would be used for samples and STDEV.P would be used for a population.