What is survey?why were survey carried out?

Survey is the method of collection of data or information regarding a particular subject or issue.

Surveys are important because it helps us to know about the actual facts and form an idea regarding the issue or subject.

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1. examine and record the area and features of (an area of land) so as to construct a map, plan, or description. EXAMPLE "he surveyed the coasts of New Zealand" HOOE THIS ANSWER IS HELPFUL
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Sorry for the spelling mistake that I made in my previous answer.. HOPE not HOOE
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 In short, a survey can be a small questionare, and a survey helps in showing other people's opinion about a particular subject or topic.
Hope this answer helps.
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