What is the doctrine of mootness?

Canada (Federal), Canada

The following excerpt is from Buck v. Canada (Attorney General), 2021 FCA 1 (CanLII):

The doctrine of mootness is engaged in cases where intervening events lead to the conclusion that a court’s decision will no longer have the effect of resolving a controversy that affects, or may affect, the rights of the parties. If a decision will have no practical effect on such rights, courts may decline to decide the case on the basis that it is moot: Borowski v. Canada (Attorney General), 1989 CanLII 123 (SCC), [1989] 1 S.C.R. 342, 57 D.L.R. (4th) 231 at para. 15.

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