What is the famous saying among computer programmers that refers to the fact that computers cannot tell the difference between good and bad data?

GIGO (Garbage In, Garbage Out)

Explanation:

GIGO is a common saying among computer programmers that computers cannot tell the difference between good and bad data. This is especially true because computers process exactly the kind of data that is given to them. They strictly operate on the logic on which they are built. So If the input is bad or invalid, a bad or invalid output will result. A good input will yield a good output.

GIGO says that "put in garbage and be ready to get garbage in return".

Garbage in, garbage out

Explanation:

Garbage in, garbage out is the famous saying among computer programmers that incorrect, poor-quality, flawed, or nonsense input will produce incorrect, poor-quality, flawed, or nonsense output while correct, good quality or valuable input will produce correct, good quality or valuable output. it is basically saying that computers cannot tell the difference between good and bad data.