Is this the backwards compatible one for the ps2 and ps1 games?

Unfortunately this model is not backwards compatible. I used to have the first generation ps3, the 80 gig model, which is backwards compatible.

Does it need the Operting System to play games?

The PlayStation 3 is an operating system in itself. You'll need to buy physical videogames to play on it. Or once you purchase the system you can purchase and download games to play on it. 120GB is not a lot of space for a game system.

ASIN	B07Q4F7FGX
Best Sellers Rank	#998 in Amazon Renewed ( See Top 100 in Amazon Renewed ) #5 in PlayStation 3 Consoles #264 in Renewed Computers & Accessories
Brand	Sony
Brand Name	Sony
Color	black
Connectivity Technology	Wi-Fi
Input Device	Gamepad
Manufacturer	Sony
Memory Storage Capacity	120 GB
Model Name	PS3
Platform	No Operating System
Resolution	1080p
UPC	647213654721
Warranty Description	90 days limited warranty
Wireless Communication Technology	Wi-Fi

PlayStation 3 Slim Console 120GB (Old Model) (Renewed)

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