From the DIKW pyramid, Knowledge...

a$.$ Takes data, categorizes and processes it generating Information, then organizes all this information in a way that it can be useful. It also allows us to detect patterns.

b$.$ Is a set of signals or symbols

c$.$ Applies systems to organize and classify data. It can also help us to understand relationships.

d$.$ Allows us to predict the future correctly, not only by detecting and understanding patterns but also deeply comprehending the "Why" behind those patterns