Activation is the process in which the survey is made ready to collect responses. Until a survey is activated, it cannot collect responses, and only the creator of that survey can view it. Activation is also the step at which the service for a survey is purchased. (For more on pricing and billing, including our subc see here.
When you activate your survey, you may decide if and when it should stop accepting responses (i.e., when it should be deactivated). Your choices are: