Can you explain to me what is meant by the term Critical path in Prince2?

I am struggling to find this on the web.

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Critical path is the line connecting the start of an activity network with the final activity in that network through those activities with zero float, i.e. those activities where any delay will delay the time of the entire end date of the plan.There may be more than one such path.The sum of the activity durations on the critical path will determine the end date of the plan.