Hi GabyS4. Thank you for reaching out. My name is Jayson, an Independent Advisor for Microsoft and a user just like you. I'll be glad to assist you.
If your device is a Laptop, there should be a built in Camera. You can open the Windows 10 Camera app to use your camera. You might need to install additional drivers for your laptop webcam, you can download the driver on your laptop manufacturer/brand website.
https://support.microsoft.com/en-us/help/402864...
But if you are using desktop PC, you can buy any webcam according to your needs (streaming, recording, remote session, etc) on any online store (Amazon, ebay, Microsoft). Then follow the link below on how to install and configure webcam.
https://www.lifewire.com/install-and-connect-a-...
Hope this helps. Let me know if you need more assistance.
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Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install.