What is SSO?
I throw a lot of acronyms around like API, IAM, IDP, SAML, OAuth and.. SSO. And at one point when I was working at my last job, I realized 'alphabet soup' doesn't mean anything unless we're using the same alphabet.
Here's 10 minute walkthough of Single Sign On -- the people, the applications and the protocols all explained in, I hope, a straightforward way.
And if you liked this presentation, you might want to take a peek at my old gem: 3-Legged OAuth -- A Love Story