What the difference We See 4G To 5G

Hi Guys,
I want to get some feedback over doubts. Now we are at an advanced level of technology. Recently 2 years back we have 3G after the 4G most people stopped using 3G mobiles and 4G didn't work on it. Let's go to 5G if the mobile release in global wide. It is not possible to use 4G mobile phones. The Difference between 3G to 4G. I saw the difference is internet speed. Is there anything in advance in 5G.