If I want to add an external monitor to my Apple MacBook, must I buy an Apple monitor, or do all monitors work with Apples?

most monitors should work with macbooks. check the manufacturer of the monitor first to see if they support macs.

You can buy adapters for the Mini DVI connection.

The adapter from Mini DVI to DVI/VGA is $20. I usually keep a 24” Sun monitor plugged into mine. About any monitor newer than 1998 will work with your macbook.

If it’s DVI or VGA or S-Video, it will work :)

Yeah all you need is a DVI to Mini-DVI adapter and a DVI monitor and you should be good to go. I have a 24” Dell plugged up to mine.

@StellarAirman: That would be a Mini-DVI to DVI adapter, not the opposite ;)

It’s all about the cables and connectors on both machines. Other than that, it’s almost always a simple plug-n-play.