Explain in depth each section according to the value they each serve.

Included collectively for around 11,000 words, along with 10 to 13 figures and images. In addition, the attachment given is a diagram which indicates the view of the system structure. Explain in depth each section according to the value they each serve. For example, why needs authentication? And what is the lifeblood of user authentication? and forth. As you would fairly see fit.