Thunderbolt 5 vs Thunderbolt 4 and 3 vs USB4

Macworld
Apple has changed its MacBook connection standard from Thunderbolt 4 to Thunderbolt 5, but some earlier MacBook Air models had their ports listed as “Thunderbolt / USB 4” and “Thunderbolt 4 and USB 4” on its Pro and Max models.What does all this mean? What is the difference between Thunderbolt 5, Thunderbolt 3 and Thunderbolt 3? And then what is USB 4?We thought that USB and Thunderbolt couldn’t get any more confusing with many different speeds (from 5Gbps