Access point vs router vs repeater vs media center extender

What are the main differences among these 4 devices. It seems like access points and routers are the same? I orignally thought an access point increased the range of your wireless network but I guess that's what a repeater does? Also, the new media center extenders, do they just act as a bridge between your PC and your TV? They're pretty expensive.
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  1. I'm no expert. My understanding is:

    AP = provides access to wireless devices, may or may not connect to a modem, has a unique IP
    Router = may have AP built-in and connects to a modem
    Repeater = extends the signal range further using the same router IP
    MCE = do you mean this?

    http://www.microsoft.com/windowsxp/mediacenter/extender/owner/stboverview.mspx
  2. Yea that's what I meant. Thanks for clearing it up.
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