There is a lot of material about magic in the PHB.
I'm wondering about how the concept of a witch intersects with the various magic domains.
From what I understand:
A warlock is granted magic from another sentient agent.
A wizard learns magic academically.
A sorcerer harnesses innate magic.
A druid harnesses the power of nature.
A cleric is granted magic by their god.
What about a witch?
Popularly a witch practices witchcraft which is a kind of malevolent magic that uses lots of spell components.
They brew potions, cast spells & curses, they recruit familiars and some can shapeshift. They can speak with the dead and cause uncanny misfortune at a distance. Maybe they can divine future events as well, often meddling in the affairs of others.
A good answer would indicate how a witch character is constructed within the existing class archetypes, i.e. not homebrew or house-ruled.