Why should you utilise grey coding rather than binary code, and what advantages does it have over binary code?

Question 3, please. Thank you

Data Representation and Processing questions: Why is binary data representation and signaling the preferred method of computer hardware implementation? What is excess notation? What is twos complement notation? Why are they needed? In other words, why can’t integer values be represented by ordinary binary numbers? What is the numeric range of a 16-bit twos complement value? A 16-bit excess notation value? A 16-bit unsigned binary value? Why doesn’t a CPU evaluate the expression 'A' = 'a' as true? CPU Data Types questions: What primitive data types can normally be represented and processed by a CPU? What are the differences between ASCII and Unicode? What is overflow? What is underflow? How can the probability of their occurrence be minimized? Why might a programmer choose to represent a data item in IEEE binary128 floating-point format instead of IEEE binary64 floating-point format? What additional costs might be incurred at runtime (when the application program executes) as a result…

What distinguishes the two terms encoding and encryption?