The will to power () is a prominent concept in the philosophy of Friedrich Nietzsche. The will to power describes what Nietzsche may have believed to be the main driving force in humans — namely, achievement, ambition, and the striving to reach the highest possible position in life. These are all manifestations of the will to power; however, the concept was never systematically defined in Nietzsche's work, leaving its interpretation open to debate.
Alfred Adler incorporated the will to power into his individual psychology. This can be contrasted to the other Viennese schools of psychotherapy: Sigmund Freud's pleasure principle (will to pleasure) and Viktor Frankl's logotherapy (will to meaning). Each of these schools advocates and teaches a very different essential driving force in man.