I need to find out what GoLogin is for work. What is the difference between MultiLogin? Are they really convenient to use as password reset tools?

You're right, you've got it right. These two services are used for convenient switching between accounts. There are professionals who have multiple social media accounts and need to keep track of them. I have also recently learnt about such a service. But you can see more details about multilogin alternative here https://gologin.com/compare/multilogin-alternative