The Razer Kiyo is a USB webcam that retails for around $100. It is capable of 720p video at 60fps and 1080p at 30fps.
The main differentiating feature of the Razer Kiyo compared to other webcams is that the Kiyo has an integrated LED light ring (with adjustable brightness) and this makes a huge difference to the image quality captured by the webcam.
As with most Razer products it is configured and controlled with Razer Synapse, where things like brightness, contrast, saturation, white balance and auto\manual focus can be configured.
The Razer Kiyo has a strong streaming focus and is fully compatible with Open Broadcast Software (OBS) and Xsplit.
The Kiyo does however have two shortcomings, firstly the auto focus is not well implemented, and continuously refocuses for even the slightest movement, resulting in the auto focus being pretty much unusable. The second shortcoming is that the built-in microphone is not great, this is however a very common problem with webcams.
Even with these shortfalls the Razer Kiyo is a compact and convenient solution compared to alternative camera\lighting solutions. It is a good all in one solution as long as you use manual focus and an external microphone.