A census is a survey of the whole population. So in general, it is a sheet of questions sent to everyone in the country.
A poll is a questionnaire usually with only one question on it. It only tests people who participate, unlike a census which is the whole population.
The difference between a poll and a survey is that a poll is only one or two questions (What is your favourite car - Nissan, Honda, Ferrari, Lamborghini, Ford, Toyota,) Whereas a survey asks a wide range of questions, usually 10 or more.
The Language Level symbol shows a user's proficiency in the languages they're interested in. Setting your Language Level helps other users provide you with answers that aren't too complex or too simple.
Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
Can understand long, complex answers.
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