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Exit polls are questionnaires that are carried out on the voters as they leave the polling areas during election time. With exit polls, the respondent is asked who they actually voted for, unlike the pre-election opinion polls, which require them to answer what they intend to vote for. This renders them a potent instrument of early estimations.

The Exit Polls Process:

• Sampling: A representative sample of polling booths is chosen by a stratified random sampling according to the past voting trends, geography (rural/urban), demographics (caste, religion, age, and gender), and size of the constituency. They do not encompass all booths.
• Interviewing: The trained interviewers come to all nth voters (e.g., every 5th or 10th) who get out of the booth. The participants receive a short anonymous questionnaire in which they fill in information regarding their vote choice, the most important issues, and their demographics.
• Data Processing: Data is raw and is collected and weighted to correct any under- or overrepresentation of particular groups, differences in turnout, and historical patterns. Advanced statistical models are then used to project votes into seats, usually by referencing their swing analysis of past elections.
• Projection: Agencies carry out simulations in order to approximate the general outcomes. In India a significant exit poll (such as Axis My India or CVoter) is polling tens of thousands to lakhs of voters during Lok Sabha or assembly elections.
• Limitations: Exit polls have a margin of error (which is normally 3-5%). They may be misconstrued by sampling bias or non-response, late swings, or the so-called shy voter behavior or turnout miscalculation. In the context of multi-phase elections, results early in the day might not be fully indicative of the subsequent results.

Concisely, the exit polls provide the initial scientific understanding of outcomes as they reflect real voter behavior, but they are estimates, not a guarantee. The Election Commission is always the last word with respect to official results.