What is Opinion Poll?

Legal Definition
An opinion poll, sometimes simply referred to as a poll, is a human research survey of public opinion from a particular sample. Opinion polls are usually designed to represent the opinions of a population by conducting a series of questions and then extrapolating generalities in ratio or within confidence intervals.
-- Wikipedia
Legal Definition
A market research technique that involves obtaining public opinion on an issue. One common application is the prediction of election results. Statistical results are calculated from the aggregated views of random sample groups.