You can sample when carrying out a comprehensive census is not feasible for any reason. It may be because a census would require too many resources (including time), be destructive (eg life span of light bulbs).
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sample size refers to the collection of data by only a selected size of te population through the process of sample surveys and sampling methods used in collecting data.
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Field Data
Data gathering in two different samples such that there is matching of the first sample data drawn and a corresponding data value in the second sample.
There is no point in collecting data simply for the sake of collecting data. You need to analyse it: summarise it and use key information from it to make some assessments about the data.