2017~2024 What does "A6" in the Listing mean?

Hello Everyone! I'm new to this form and currently looking at purchasing a 2018 CX-5 GT. I've noticed that some dealer listing are titled "2018 Mazda CX-5 GT (A6) 4dr All-wheel Drive Sport Utility" but others are just listed as "2018 Mazda CX-5 GT" I'm unable to find a difference between the two vehicles in the specifications. Would someone be able to help direct me to finding this out or know what could be the difference? Thank you!
 
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