difference between adobe illustrator and adobe illustrator CC?

In my organization, we are using adobe illustrator cc 2019.. I have updated this vesrion. and updation it's show adobe illustrator 2020. I didn't get adobe illustrator cc 2020. so please tell me what is the difference between  adobe illustrator and adobe illustrator CC. and suppose if i want adobe illustrator cc 2020 then what will i do? please help me