First, I like the term identity. Software developers will argue for terms like Authorization or Authentication, but I don’t use those terms because, WTH, they are too functional.

For founders, it comes down to knowing who is on your site, who has access to some features, and who does not.

So, identity.

Many solutions are available for controlling access, starting with simple usernames and passwords and extending into third-party solutions like Auth0 and Okra. Startups often select options that allow the user to select the identification process that works best for their customers and user cases. So, logging in using Gmail, Facebook, etc., is all available.