Merits and demerits of sample survey?

Sample surveys are a valuable research tool as they allow researchers to collect data from a subset of a population, providing insights that can be generalized to the larger group. They are cost-effective, efficient, and can provide a snapshot of public opinion. However, sample surveys can be prone to sampling bias if the sample is not representative of the population, leading to inaccurate results. Additionally, survey responses may be influenced by respondent bias or social desirability bias, affecting the validity of the data collected.