In layman’s term, these words are sometimes interchanged; sometimes we are talking about the hub when we meant the switch and so on. These are all devices being used for networking: a collection of computers and its peripherals connected physically using a cable or wireless. Imagine a PC connected to the internet using a MODEM, wired. You can’t connect using no MODEM to DSL line. We are not talking about DIAL-UP connection either. MODEM used in DIAL-UP is different for DSL connections, don’t be confused. That is basic, ayt. 
Now let us connect another PC but the modem has only one port. So we use a ROUTER. The 2 computers are now connected wired to the ROUTER and then the router is connected to the MODEM and the MODEM to the telephone port. If you want to connect those 2 computers wireless, you can do so since the ROUTER is capable for wireless connections. Any number of computers can connect to it wireless but for wired connections, the maximum is 8 PC, most commonly ROUTERS have 4 ports. The signal speed will be the same for the entire PCs. 
Where is the HUB? You can replace the HUB to the ROUTER from the above setting. HUBs have 4,8 or more ports so PC’s can be connected to it, unfortunately, the more number of computers connected to it, the speed of the internet connection will be lessen. And HUBs don’t have wireless capabilities.
What if there are like 20 PC’s for office set-up? Use a switch. FYI we now have a MODEM-ROUTER in one device. It functions as a modem and router at the same time. Instead of purchasing 2 devices, you can now purchase only 1 device. 
...to end: count then share your blessings to others...
Now let us connect another PC but the modem has only one port. So we use a ROUTER. The 2 computers are now connected wired to the ROUTER and then the router is connected to the MODEM and the MODEM to the telephone port. If you want to connect those 2 computers wireless, you can do so since the ROUTER is capable for wireless connections. Any number of computers can connect to it wireless but for wired connections, the maximum is 8 PC, most commonly ROUTERS have 4 ports. The signal speed will be the same for the entire PCs. 
Where is the HUB? You can replace the HUB to the ROUTER from the above setting. HUBs have 4,8 or more ports so PC’s can be connected to it, unfortunately, the more number of computers connected to it, the speed of the internet connection will be lessen. And HUBs don’t have wireless capabilities.
What if there are like 20 PC’s for office set-up? Use a switch. FYI we now have a MODEM-ROUTER in one device. It functions as a modem and router at the same time. Instead of purchasing 2 devices, you can now purchase only 1 device. 
...to end: count then share your blessings to others...
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