What is/are “social insurance” programs (provide an example from the presentation), and what is their utility in social welfare?

What is/are “social insurance” programs (provide an example from the presentation), and what is their utility in social welfare?
For presentation click this link
https://montclair.instructure.com/login/ldap then login username: Basufe1 password Emb010300! Then click on where it says courses and click on sowk220 then go to modules then go scroll down to module 6 and watch the video says “Dr. Brad presentation: M06- economic dimensions” then u answer assignment question