If you're on a spiritual path it could mean a quite space to contemplate the world and your role in it. Or the clarity of mind to enable you to move forward and manifest your highest vision. Then again if you're a staving child peace could simply mean the end of hunger pangs and the doubt and fear as to where your next meal is going to come from. Ultimately peace is no more or less than a state of mind reflected in our immediate environment, and it can never be realised unless all our needs are being met. Which leads me to the next question.
Needs are unique to the individual.
I'm in a human body. I need food and water. I need shelter - both clothing and housing. I need healthcare. And I need a safe and secure environment which is conducive to enabling these needs to be met.