What is a survey?
"An investigation of the opinions, behaviour, etc. of a particular group of people, which is usually done by asking them questions"
We use surveys to measure a particular parameter within a given population without having to measure the whole population so that the information provided by a few individuals can be used to estimate data for the entire population. This technique is known as sampling.
The resources here provide an introduction to surveys, and highlight some of the considerations you should make when planning your survey.