Understanding The 'Canadian Emergency' and Truckers Freedom Convoy

What in the Canadian "Emergency Act"? Who, what, when, where, why of the "Freedom Convoy(s)".

US ‘freedom convoy’ inspired by Canada bids to organize for Washington trip
https://www.theguardian.com/us-news/2022/feb/14/us-freedom-convoy-canada-covid-vaccine

National guard troops to be deployed in DC as trucker convoy protests loom
https://www.theguardian.com/us-news/2022/feb/22/national-guard-deployed-dc-trucker-convoy

Lawmakers support Trudeau; Canadian Parliament votes to extend emergency powers
https://www.arkansasonline.com/news/2022/feb/22/lawmakers-support-trudeau/?latest

Canada’s Emergencies Act
https://www.canada.ca/en/department-justice/news/2022/02/canadas-emergencies-act.html