Any modern computer that is capable of running web browser such as Internet explorer, Google Chrome, Firefox ect will do, You will also require a webcam and microphone. Most new laptops come with these options built in.
The software used also allows for the video conferencing to happen over a smart device such as a tablet or a smart phone, keeping in mind that large data charges may apply depending on your mobile plan.

Your internet speeds should be at least 15Mbps download and 5Mbps upload. 
While video streaming can happen with slower internet connections, these are the speeds needed to have the clear video experience you want.
If you’re not a tech-person, you might be wondering what “15mbps” really means and how you test your internet speed. An easy way to check your internet connection speed is to go to speedtest.net. Simply click “Begin Test” and speedtest will tell you exactly what your download and upload speeds are.
If you consistently have a poor internet connection on your end, you may want to contact your internet provider and ask them about upgrading your service.