Radio buttons are a one-answer solution in Netigate. They are perfect if you have, for example, a Yes/No question or if you want respondents to choose on a scale (e.g. 1-5). Essentially, they are a good choice for all questions where respondents should only be allowed to select one answer alternative.
Checkboxes are a multiple-answer solution in Netigate. You use this question type when you want respondents to be able to choose more than one answer alternative. You can even determine how many alternatives the respondent can select, e.g. max. 3 answer alternatives.