The best webcams you can buy | Engadget
Briefly

Resolution is crucial; for many users, 1080p webcams provide a significant improvement over the typically inadequate 720p webcams found in laptops.
When it comes to video quality, external webcams make a difference for professional calls and personal video chats, enhancing the overall video experience.
Look for webcams with at least 1080p at 30fps for regular video conferencing; higher fps is ideal for less motion blur.
4K webcams are often unnecessary due to limited support on video conferencing platforms, hence most users can settle with a reliable 1080p camera.
Read at Engadget
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