I think of it like cheques in the legacy system.

Most organizations require two signatures on a check. Owners, finance team, board of directors, etc.

This is meant to reduce fraud risk and eliminate the single point of failure.

Cheques cannot be written and payments cannot be made without having two signatures on the cheque.

With multi sig, this provides the same function only for bitcoin. So you can’t move any bitcoin out of the wallet unless you have two signatures.

It’s a great set up for advanced users and organizations.

There are better ways of eliminating the single point of failure for people who are newer to bitcoin.