Rating is a scale with stars or smiley icons on a scale from 1 to 5.
Open question is an open question, in which the user can type in text.
Multiple choice is a list with options which the user can select (multiple answers are possible).
Single choice is a list with options which the user can select (multiple answers are not possible).
Net Promotor Score is a scale from 1 to 10 on which the user can indicate if they would recommend the product/service/location to other peopel. Also see' What's NPS?'
Contact form is a form on which the user can add their personal details or remarks.