please help me to understand the meaning of Certified questions in Canada?

74 Judicial review is subject to the following provisions:

(a) the judge who grants leave shall fix the day and place for the hearing of the application;

(b) the hearing shall be no sooner than 30 days and no later than 90 days after leave was granted, unless the parties agree to an earlier day;

(c) the judge shall dispose of the application without delay and in a summary way; and

(d) subject to section 87.01, an appeal to the Federal Court of Appeal may be made only if, in rendering judgment, the judge certifies that a serious question of general importance is involved and states the question.

2001, c. 27, s. 74; 2015, c. 20, s. 53.