How do circuit boards make electronics do things?
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[Circuit boards are wires](https://upload.wikimedia.org/wikipedia/commons/e/e6/Computerplatine_Wire-wrap_backplane_detail_Z80_Doppel-Europa-Format_1977_(close_up).jpg). They’re just layers of [wires](https://c8.alamy.com/comp/D5EC12/blue-printed-circuit-board-or-abstract-background-D5EC12.jpg) pressed together into a rigid board.
The point is to connect the outputs of [electronic chips](https://www.shutterstock.com/shutterstock/photos/1851253342/display_1500/stock-photo-closeup-electronic-circuit-board-pcb-components-detail-and-an-integrated-circuit-ic-1851253342.jpg) to power and to each other, and the electronic chips will do “things”.
The chips contain miniaturized transistors, capacitors, resistors, and other components that manipulate, store, and release electricity in certain patterns that allows ultimately patterns to form on the screen (which you recognize as words, an image, a website, etc.), audio patterns to be vibrated by the speakers (sound), droplets of ink to be squirted on a page by a printer, and so on.
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