SaaS Onboarding Survey

I want to set up survey for when people sign up for a new account on our platform. I've seen a bunch of SaaS platforms do this, collecting info about how the person heard about them, what industry they're in, etc. I'm wondering if there are existing tools that I can easily integrate to do this? Also, has anyone here done this? And, if so, what kind of questions did you ask and how did the data help you? What did you do with the data?