Used when discussing actions regulated by law or official rules. Wearing helmets while riding a bike is obligatory in this city.
Pro Tip 2/3
Not Optional
Implies that there is no choice but to comply with a rule or requirement. Attendance at the safety training is obligatory for all new employees.
Pro Tip 3/3
Consequence
Failing to do something obligatory can lead to penalties or negative outcomes. Submitting a tax return is obligatory and missing the deadline may result in a fine.