Hmm... it is the question of what do you mean under "Survey" I suppose.
As far as I know (but correct me if I'm wrong) the Poll and Survey in the case of web are the similar terms, synonyms. When giving this add-on a title, I've researched the web a bit and discovered in most cases the same thing could be called "poll" or "survey" as well. They both have the similar algorithm in background: you give some question, people answer this question and that way the statistics are populated in common.
This add-on has actually two poll/survey options: you could set up so users could choose only ONE answer to your question (that would be a Poll), or they could give MANY answers (that would be a Survey).