Is there a Limit to Number TCP Connections a Backend can handle?

Someone asked me a question and I felt its interesting to make a video about, is there a limit to the maximum number of TCP connections a Client can make to the server? If there is what is it? and how does that make sense in all the configurations? 0:00 Intro 1:00 Is there a Max Connection Limit? 4:30 64K Connection Limit Explained 7:20 Max Connections on Reverse Proxies and Max Connections 14:30 How does Router get around Max Connections? 7:00 3 million whatsapp https://www.youtube.com/watch?v=vQ5o4wPvUXg 10:25 envoy https://www.youtube.com/watch?v=40gKzHQWgP0& 12:50 google https://www.youtube.com/watch?v=CUiBVTcgvBU 14:00 Active Active https://www.youtube.com/watch?v=d-Bfi5qywFo