What is the difference between CDMA and GSM?

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What is the difference between CDMA and GSM?

Suppose I put you into a room with your friend and each one of you have been given a cell phone. The room has a partition in between.
Scene 1:
Both of you speak the same language and you have been provided the first thirty minutes of an hour(say 10:00- 10:30) and your friend has been provided the next 30 mins(10:30-11:00) to make a call from your respective partition to your gf.
You dial your girlfriend and you find out about the affair she is having with some random friend of yours. You shout and scream on top of your voice and the guy on the other side understands how you got screwed. He makes the call in the next 30 minutes and you can hear him and you know the son of a b!@#h got your gf!!!
This my friend is TDMA!!
"TDMA (time division multiple access) is a technology used in digital cellular telephone communication that divides each cellular channel into three time slots in order to increase the amount of data that can be carried.TDMA is used by Digital-American Mobile Phone Service (D-AMPS), Global System for Mobile communications (GSM), and Personal Digital Cellular (PDC). However, each of these systems implements TDMA in a somewhat different and incompatible way."
Scene2:
Both of you speak a different language now and you both can call at the same time!!! Isn't that more secure? You get the entire 1 hr to talk and your gf doesn't get the chance to cheat on you. :)
This my friend is CDMA!!
"CDMA (code-division multiple access) refers to any of several protocols used in so-called second-generation (2G) and third-generation (3G) wireless communications. As the term implies, CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth."

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