"As is" usually means "as it is in its current/basic/normal state", ie without any additions or without making any changes to it.
I bought a computer last week. I could use it "as is" or I could choose to personalise it, add programs I want and perhaps even take it apart and mess around with the hardware, change the operating system etc. If I choose to use it "as is", I can just open the box, plug in the computer and start using it without making any changes.
Student or Learner