DD-WRT Wireless → Basic Settings differences

There are various options in DD-WRT under Wireless → Basic Settings.
http://www.dd-wrt.com/wiki/index.php/WebInterfaceWirelessBasicSettings
They are as follows:

1. AP (Access Point)
2. Client
3. Client Bridge
4. Repeater
5. Repeater Bridge
6. Ad Hoc

Options explained here:
http://www.dd-wrt.com/wiki/index.php/Linking_Routers

A simulation could be found here
http://www.informatione.gmxhome.de/DDWRT/Standard/V24BetaVPN/Wireless_Basic.html
http://www.dd-wrt.com/demo/

The difference between them can be explained better using images.
AP (Access Point)



Client / Client Bridge



Repeater / Repeater Bridge