Most PCBs have a component legend to show which component goes where and is known as Silkscreen or Legend. This is a printing process and the must be cured.
Page 2 – RAYPCB
Silkscreen - PCB Prototype the Easy Way - PCBWay
Silkscreen Sierra Circuits
The guidelines of PCB silkscreen design
PCB production – Eurocircuits
What is the Solder Mask? - PCB Directory
During Production - Eurocircuits
Anyone aware of custom PCB houses that do full-color silkscreen? : r/AskElectronics
Part 21 - Silk screen and cure
Silkscreen PCB Printing Methods, Process, Design Guidelines, and More – Hillman Curtis: Printed Circuit Board Manufacturing & SMT Assembly Manufacturer