Yes, you are generally allowed to leave the airport during a layover, but your ability to do so depends on your visa status and the time available. For domestic flights, you can walk out of the terminal freely, as you have already cleared security and no immigration check is required. For international flights, you must pass through Passport Control and Immigration to officially enter the country, which requires you to have a valid visa or be from a visa-exempt nation. It is generally recommended to only leave the airport if your layover is at least 6–8 hours long. This provides a buffer for deplaning, clearing immigration (which can take 1–2 hours), traveling to the city, and—most importantly—returning to clear security and immigration again before your next flight. Keep in mind that you are responsible for being back at the gate on time; if you miss your connection because of traffic or long security lines, the airline is not obligated to rebook you for free. Always check if your bags are checked through to the final destination so you don't have to lug them into the city.