Those who practice mage craft, the arcane traditions of magic, learn how to see strands of Dream Force that has seeped onto the earth, and can weave it together with the readily abundant Life Force to cast their spells. They do so in different ways.
Sorcerers have an innate, instinctive ability to see and tap into both Life Force and Dream Force, and over time develop their ability to weave these forms of energy together. For Wizards, that ability comes through years of study. Warlocks and witches are considered to practice arcane magic, but their power comes through a pact with an otherworldly patron who weaves the two forms of energy themselves and then transmits it to the warlock, similar to practitioners of divine magic. Other classes, including bards, arcane tricksters, eldritch knights, rangers, and others also practice variations of arcane magic.
Arcane magic is distinct from Divine Magic, in which powerful deities in the Outer Planes transmit Dream Force to their worshippers.