Yes. Often hundreds and sometimes (eg in a population Census), millions.
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It is a measure of the spread of the distribution. The greater the standard deviation the more variety there is in the observations.
Organizing the data into a frequency distribution may make patterns within the data more evident.
Simple frequency distribution is a method of organizing large data sets into more easily interpreted sets. An example is organizing sample test scores by the individual scores.
The 2k or 2 to K rule is used to determine the number of classes for a frequency distribution. The 2k rule should be used as a guide more than a dictator of determining the number of classes for a frequency distribution.
Organizing the data into a frequency distribution can make patterns within the data more evident.