GSM vs. GDMA confusion

[nanapull3]

Redeeming points earned on a credit card and want a new phone. Can't decipher if this one works with AT&T. Any help is appreciated as I know nothing about GSM or CDMA. Help and TIA.

Galaxy S7 32GB - UNLOCKED
Please note: This is a GSM phone and will NOT work on CDMA Networks such as Verizon®, Sprint® or US Cellular®, or any other CDMA Network.

 

[L0n3N1nja]

AT&T is a GSM network, should be good.

 

[L0n3N1nja]

They are just different network technologies, I don't know the technical differences myself.