My brother-in-law called about a bail hearing and I had no idea how to explain sureties

https://spacestyle.theglensecret.com/from-breath-test-to-bail-hearing-when-a-dui-leads-to-additional-charges-in-toronto

My brother-in-law sent a message about a bail hearing and I had no idea how to explain sureties, we panicked through questions until a friend finally found info online.