Dear aspirant,

This is primarily a career related doubt service , but I will try to answer your question regardless.

Opinion polls are used after elections to gauge the possibilities of the government being formed by one party or the other. Most opinion poll experts appear on television and use (or attempt to use) complex data analysis as well as on ground surveys and interviews to predict the results.

Many a times opinion polls issued by various experts have turned out to be false. Therefore, there is no actual science behind opinion polls. They serve as a popular and engaging gimmick to keep the voter entertained during the election season.

I hope this helps! Best of luck!