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A public defence, i.e. a public examination of a doctoral thesis, is a ceremonial occasion that follows academic traditions. During the proceedings the doctoral student defends the results of their doctoral thesis against public criticism and answers questions presented by the opponent. The course of the public defense is supervised by the custos, i.e. chairperson. 

The proceedings follow a strict protocol and dress code. The audience comprises of colleagues in the field as well as close relatives and friends of the doctoral student. Customarily the defence takes approximately two hours. Afterwards, doctoral students usually offer refreshments to the audience. A remote or hydrid format defence is also possible.

The post-doctoral party, or "karonkka" marks the end of the doctoral thesis process and is arranged by the doctoral student to thank the opponent, the custos and others who contributed to the work.