Ranking allows respondents to rank/choose the order of their answers in response to a question. For example, they may be asked to rank a selection of factors from most to least important. Respondents can only select each column once.
To use ranking in your surveys, you must be in Edit mode and choose to add a Matrix question type. Once you have added your question content, mark the Ranking checkbox to activate ranking. The respondent will then automatically see the ranking in the form of a classic matrix.