If you're now trying to wrap your head around Ontario's shutdown just as you were getting comfortable with the colour-coded zones, don't panic.\nHere's a breakdown of the key terms and definitions you didn't know you'd need to know before the pandemic — and there won't be a pop quiz, we promise. \nEditor's Choice: Here's What You're Still Allowed To Do This Weekend Under The Province's New Shutdown\n\nOntario's provincewide shutdown\nNot unlike the shutdown that Ontario implemented in December, the entire province is now back under the same restrictions for a four-week period, starting on April 3, 2021.\nThese shutdown rules are similar to those in the grey-lockdown zone (we'll get to that later) but more restrictive.\nFor example, the lockdown zone was recently revised to permit outdoor dining, but it is prohibited during the shutdown.\nUnder the shutdown, all retailers are allowed to remain open at a limited capacity, while most other businesses including gyms and salons must remain closed. \n\nEmergency brake\nBack when the province began to allow regions to gradually reopen, officials introduced their new "emergency brake" system.\nThis brake allows health officials to swiftly move regions from their colour-coded zone back into the lockdown zone if transmission increases. \nIn the case of the new shutdown, officials stated that a provincewide emergency brake was activated in response to the third wave.\n\nStay-at-home order\nIn January, the premier announced a provincewide stay-at-home order, which prohibited Ontarians from leaving home for non-essential reasons.\nEssential trips were defined as accessing goods and services necessary for an individual's safety, health and wellbeing.\nThese could include outings for groceries, medication, exercise, work or health care. However, the province said that essential reasons vary from person to person, and there is no limit to how many you can take in one day.\nOfficials made it clear that a stay-at-home order is not being enforced during the current shutdown to encourage people to get outside safely.\nState of emergency\nThe province first declared a state of emergency back in March of 2020, and a second one was declared in January 2021.\nThe state of emergency allows Ford's government to unilaterally impose new rules such as the shutdown, stay-at-home order and other public health measures.\nAll emergency measures under the Reopening Ontario Act were recently renewed.\n\nLockdown\nThe term lockdown refers to the grey-lockdown zone of the provincial framework.\nThis zone prohibits indoor gatherings of any size, indoor dining, as well as personal care services, cinemas and gyms. Outdoor gatherings of five people and in-person shopping are permitted.\nThe zone was recently adjusted to allow patio and outdoor dining to resume and was even poised to allow personal care services to reopen by appointment only on April 12, 2021.\nColour-coded zone framework\nThe colour-coded zones, a.k.a. the COVID-19 Response Framework, are the various zones that represent the level of reopening permitted in the region.\nThe five zones are green-prevent, yellow-protect, orange-restrict, red-control and grey-lockdown. \nGreen is the zone with the fewest restrictions, permitted in areas with the lowest positivity and transmission rates. The levels increase from there.