If your computer is attached to a separate monitor (rather than having one built into it) I assume that it's a desktop model and not a laptop.
As I wrote above, I've never encountered a desktop PC with a camera or microphone built into it. (Laptops usually have cameras built into their lids, facing the user, so that they can be used for video calls on Skype, etc. It's hard to see where a camera could be positioned on a desktop in a way that would be useful to the user).
So if (as seems likely, given that you're using a standalone monitor) you've got a desktop PC, then it WON'T have a camera or microphone built into it. If you've actually got a laptop though, then it almost certainly WILL have a camera and microphone built in.
It's easy enough to add a camera to a desktop PC though. Webcams come in a vast range of qualities and prices, from little more than a few quid up to hundreds of pounds. For an occasional user (who only needs a camera for Skype, etc) many review sites recommend the Microsoft LifeCam HD-3000 for around twenty quid:
https://www.johnlewis.com/microsoft-lifecam-hd-3000-hd-webcam/p231297443
(It includes its own microphone and it simply plugs into a USB port)