The Pax Romana was a peaceful period of time between 27 BC and 180 AD. "Pax Romana" translates to "Roman peace."
This peace was established by Augustus so this time period was also referred to as "Pax Augustus."
During this time, individual provinces were protected and governed by the Roman Empire. These provinces were permitted to make administrate their own laws but they still had to accept Roman taxation and military control.
August was Rome's ruler for 40 years and during this time he helped the Empire flourish. He had a hard time convincing the people of Rome that life without conflict can be successful. Eventually his message was achieved by promotion.
In conclusion, the main focus of Augustus was to make sure there was law, order, and security within the Roman Empire. Law, order, and security will be achieved even if it meant that Rome had to be separated from the outside world, fighting for, or even expanding its borders through the military and conquest.