Quantative Analysis Network models: Shortest route technique

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The topic is network models for problem solving .
Briefly describe the steps of the shortest-route technique as well describe the minimal-spanning technique.
I need a 200 word explanation for my study guide, please no cut & paste.

Steps of the Shortest-route technique:

Consider an undirected and connected network with two special nodes called the origin and the destination. Associated with each of the links is a nonnegative distance. The objective is to find the shortest path from the origin to the destination.

(1) Objective of nth iteration :
Find the nth nearest node to the origin (to be repeated for n = 1, 2, ..... until the nth
Nearest node is the destination.

(2) Input for nth iteration :
(n - ...