Survey Piping is a feature which allows the survey to automatically incorporate survey information and answers from previous questions, into upcoming questions and answers.
You can also customize the survey to include respondent-specific information. See below examples.
Let's say you have a survey in which you ask a respondent what their favorite color is for question #1. You can then pipe their answer into other questions or answer choices. If they selected blue as their favorite color, you can pipe that into the next page and ask a question such as "Do you like blue jackets?".
If you fill out the email grid, you can add custom info throughout the survey. For example if you know the respondent's first name, enter it into the grid, then use the piping tab to place the respondent's name throughout the survey.
There are two types of questions for piping. "Sender" and "Receiver" questions. The "Sender" question is the question to grab an answer from and the "Receiver" question is the question you place that answer in.