# Why SEO matters, and what ranks a page (/docs/why-seo-matters)

---
type: Document
title: Why SEO matters, and what ranks a page
description: Why SEO is treated as a standalone skill in this course, and the balance of factors (authority, content, backlinks, niche difficulty) that decide a ranking.
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## SEO as a skill, not just a task

SEO is treated as a skill in its own right, separate from any one business:

- SEO itself is a skill: blogging is one part of a business that uses it.
- Freelancing is a job built on it; niche research costs time; site
  development costs domain, time and design; off-page SEO costs time too.
- The point to remember: whatever you invest in it, ranking pays back as
  profit.

## What a ranking balances

A page's ranking rests on several factors working together, not any single one:

- **Authority**: builds trust and credibility, and influences ranking directly.
- **Content**: high-quality, relevant content is essential to ranking at all.
- **Contextual backlinks**: links from relevant, authoritative sites carry more
  weight than generic backlinks.
- **Backlinks (general)**: contribute to overall site authority.
- **Website**: the foundation every other SEO practice is applied on top of.

## Niche-level ranking factors

- **EMD (Exact Match Domain)**: a domain that exactly matches a search query,
  which historically helps ranking.
- **RD (Referring Domain)**: a domain linking to your site; more (and
  stronger) referring domains raise authority.
- **Topical authority**: built through pages with in-depth, relevant content
  on one subject.
- **Site design**: the structure and user experience of the site, affecting
  both SEO and usability.
- **Profitability**: the revenue potential the SEO effort is working toward.
- **Volume, country, language**: search volume, geography and language
  together shape which strategy applies.

## SEO now includes AEO and GEO

SEO is often called the mother of digital marketing: most other channels
(content, social, paid) eventually lean on it. What is new is that "ranking"
no longer means only a link on a results page:

- **AEO (Answer Engine Optimization)**: optimizing to be the answer an AI
  assistant gives directly (e.g. a voice assistant or an AI Overview), not
  just a link it shows.
- **GEO (Generative Engine Optimization)**: optimizing to be cited or used
  as a source when a generative AI (ChatGPT, Claude, Gemini) composes an
  answer.

Both sit on top of the same foundation as traditional SEO (real content,
real authority, real structure) rather than replacing it.

## How platforms measure authority

- **Google** ranks pages using its own PageRank-derived signals.
- **Ahrefs** reports **DR (Domain Rating)**: its metric for a site's backlink
  authority.
- **Moz** reports **DA (Domain Authority)**: its equivalent metric.