Notes for C.5.1 Web as a Directed Graph - IB | RevisionDojo
C.5.1 Web as a Directed Graph Notes
Understanding Web as a Directed Graph
The World Wide Web is a vast network of interconnected web pages. To understand how these connections work, we can represent the web as a directed graph, also known as the web graph.
Definition
Directed graph
A collection of vertices (nodes) connected by edges (links) that have a specific direction.
In the context of the web:
Vertices represent web pages.
Edges represent hyperlinks that point from one web page to another.
Note
The web graph is not a complete graph.
This means that not every web page links to every other web page.
Key Characteristics of the Web Graph
Directed Edges:
Hyperlinks have a direction.
If Page A links to Page B, there is a directed edge from A to B, but not necessarily from B to A.
Sparsity:
The web graph is sparse, meaning most web pages link to only a small subset of other pages.
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Definition
Paywall
(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.
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Note
Introduction to World Wide Web
The World Wide Web can be visualized as a massive network of interconnected web pages, where each page is a node and each hyperlink is a directed edge. This structure is known as a directed graph or web graph.
A directed graph consists of vertices (nodes) connected by edges (links) that have a specific direction.
In the web graph:
Vertices represent web pages
Edges represent hyperlinks pointing from one page to another
DefinitionDirected graphA graph where edges have a specific direction, indicating a one-way relationship between vertices.
AnalogyThink of the web graph like a city map where intersections are web pages and one-way streets are hyperlinks.
