Does the HP 21.5" All-in-One PC come with a built-in monitor?

Yes, the HP 21.5" All-in-One PC includes a monitor.

What type of processor does the HP 21.5" All-in-One PC use?

The HP 21.5" All-in-One PC uses an Intel Pentium Silver J5040 processor.

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HP 21.5" All-in-One PC, Intel Pentium Silver J5040, 8GB SDRAM, 128GB SSD, Snow White, Windows 11 Home in S mode, 22-dd0143w Desktop Computer

The HP All-in-One PC lets you tackle your busiest days and save everything you love with the performance of a reliable Intel Pentium Silver Processor and abundant storage. With Intel UHD graphics, you can smoothly stream 4K content and play your favorite games. Plus, a three-sided micro-edge display lets you see more of your screen with a pop-up privacy camera that tucks safely away when not in use.