Question

What is Unification and Reductionism?

Answer 1

Unification is the act of unifying the different laws valid for different phenomena in to a single theory that explains all the different phenomena.

Example: Electricity, magnetism and light are different phenomena and have different laws of physics for each of them. These are unified under theory of electromagnetism; all these three phenomena can be explained from this theory of electromagnetism.
Reductionism is breaking down of a complex system in to simple constituent systems to so that laws of physics can be applied on these systems and we can understand the working of the complex system.

Example: A complex music can be broken down to simple sine waves so that we can make the music piece from the simple tones.