The UV Index provides a daily and hourly forecast of the expected intensity of ultraviolet (UV) radiation from the sun. Some exposure to sunlight is enjoyable. However, too much sun can be dangerous. Overexposure to the sun's ultraviolet radiation can cause immediate damage, such as sunburn, and long-term problems, such as skin cancer and cataracts.
All polls are surveys based on samples drawn from parent populations. A poll's purpose is to make accurate inferences about that population from what is directly learned about the sample through questions the sampled persons answer. Knowledge of the sample is just a means to that end.
For this reason, survey research should be about focus groups and not just polls. In political research, polling and focus groups should go together like a horse and carriage. But, often the only kind of research that campaigns conduct is a poll. Polls serve an important need in politics but they are rigid, structured and formal. If a political campaign is an effort to build a candidate and win an election, the information from the poll would provide the skeleton and the focus groups would supply the skin.