I was first introduced to Maslow's Hierarchy of Needs by my brother who was taking a psychology elective at Virginia Tech.
Maslow's hierarchy of needs is a pyramid of needs necessary to reach self-actualization. It states that in order to get to the highest point in the pyramid, your previous needs have to be taken care of. When one need if fulfilled, a person seeks to fulfill the next one, and so on. The five-stages of the pyramid are biological and physiological needs, safety needs, love and belongingness needs, esteem needs, and then finally actualization needs.
Biological and physiological needs: air, food, drink, shelter, warmth, sex and sleep
Safety needs: protection and freedom from fear
Love and belongingness needs: friendship, affection and love
Esteem needs: achievement, independence, and self-respect
Self-Actualization needs: realizing personal potential and self-fulfillment
Resources used:
McLeod, Saul. "Maslow's Hierarchy of Needs." Simple Psychology. N.p., 2007. Web.
6 May 2015. <http://www.simplypsychology.org/maslow.html>. 
