Two-Factor Authentication

I have not heard of this till this morning.  
I guess if I get locked out because the last thing I want to put on my phone is another app and to have to have a device with me to get on here to share tips and experiences with those that come here.  
It was a lot better when there was just one place for the SolidWorks questions and answers.  as I look at just about 1% of what is available on this site.   Enjoy and if I go missing this could be the reason why.