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

https://telegra.ph/Can-a-Toronto-DUI-Lawyer-Get-Your-Impaired-Driving-Charge-Dropped-05-22

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