Can someone explain me the difference between those three devices?
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Hubs are also called repeaters if they actually resend the signal instead of literally just splitting it to multiple ports.
Hubs are generally dead in the consumer space because switches are the same price and better for almost all use cases. In industrial spaces, hubs still exist because they have essentially zero latency and jitter, which is very good for deterministic Ethernet protocols used by PLCs (Powerlink, EtherCAT, Profinet IRT, SercosIII, Veran, etc.). Many of those protocols are poll and response based too, so everything is a broadcast, eliminating any benefit of a switch. However newer switches are now fast enough that they will work in such applications, so even in industrial spaces, hubs are becoming more rare.
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