@Allahy3een 

Judging by the C80's user manual this router doesn't appear to support WDS or Repeater mode.

Apart from that, a dedicated Wi-Fi repeater might be slightly cheaper, but you will ever be able use it as a repeater only, while if you bought a Wi-Fi router with Repeater/WDS feature, then you could also use it as a Wi-Fi router if your situation ever changes.

Can you tell us the brand and model number of the Wi-Fi router whose Wi-Fi signal you want to repeat?

  @woozle 

thanks for replying, I already checked WDS has been added to the c80 but my question is does using WDS is better than using repeater? speed and range wise 

  @Allahy3een 

Whether it's called "WDS" or "Range Extender" or "Repeater" doesn't matter with regards to range and speed.

And I think a general statement about router used as repeater vs. dedicated repeater can't be made.

What I mean is, it may be that router model "A" provides better range and speed than repeater model "B", but it's also possible that repeater model "C" provides better range and speed than router model "D".

Personally, when it comes to extending/repeating a Wi-Fi network I am more concerned about compatibility issues.

  @woozle let's say wds is compatible can it be better than repeater/range extender 

  @Allahy3een 

WDS is better because you can use LAN ports to connect whatever you need by cable. I have done this for over 6 years with my customers. WDS bridge and cable connections, but as far as I know, C80 does not have WDS. You need to use a C5W, C6, C8 ou C9.

  @Allahy3een 

In Brazilian firmware there is no such option.

You can check here:

https://emulator.tp-link.com/c80/index.html#hostNwAdv