Q:

What is mac process "Wi-Fi"

I am running Mac OS X Yosemite. Today I ran across a process named "Wi-Fi" in Activity Monitor.   

The name catches my attention so I google around, but found little info about what the process does.
Even more weird, the corresponding app of the process seems to have TWO names:
/System/Library/CoreServices/WiFiAgent.app    

In Finder, it shows a different name Wi-Fi.app

So what is this process? Is it legit?

A:

WiFiAgent.app is part of OS X and is the agent responsible for all things Wi-Fi in the GUI.
This includes everything from managing the menu bar item to showing dialogs for entering the wireless key of the network. The agent runs in the background on all Macs with a wireless service.
Here's a converted version of the WiFiAgent.app Localizable.strings which shows some of the features of the agent through the messages that can be localised.
The reason why WiFiAgent.app is shown in Finder as "Wi-Fi.app" is because of CFBundleDisplayName:
{   CFBundleDisplayName = "Wi-Fi";
    CFBundleName = "WiFiAgent";
}

Contents/Resources/InfoPlist.strings

A:

@grgarside points the way. I want to note the steps of solving problems like this.

Double click the process name in Activiy Monitor, then select "Open Files and Ports" tab, identify the related file path of the process
Locate the file in Finder (cmd-shift-G) > right click the file > Show Package Contents
View Info.plist in any text editor
To view *.strings (eg. InfoPlist.strings or Localizable.strings), use this web service

