SEARCH ENGINE OPTIMIZATION

SEO (Search Engine Optimization) is the process of improving a website to increase its visibility on search engines like Google, Bing, and Yahoo. The main goal of SEO is to rank a website higher in search engine results pages (SERPs) so that more people can find it when they search for related products, services, or information.

There are mainly 3 types of search engine based on how they collect and display information.

(1) Crawler-Based Search Engines

These search engines use automated bots (called crawlers or spiders) to scan and index websites. 
Examples:

. Google

. Bing

.Yahoo

Crawler-Based Search Engines – How It Works

  • Use automated programs called crawlers or spiders.

  •  Crawlers visit web pages on the internet.

  •  They read and analyze the content and keywords on each page.

  •  They follow links to discover new pages.

(2)Directory-Based Search Engine

A directory-based search engine is a search engine where websites are manually reviewed and organized into categories by humans.

Example:

  • DMOZ (Open Directory Project) – now closed

  • Yahoo Directory (earlier version)

Directory-Based Search Engine – How It Works

  • Website owner submits the website to the directory.

  • The website is reviewed by human editors.

  • Editors check the quality and relevance of the website.

  • If approved, the website is placed in the correct category and subcategory.

Example: Yahoo Directory (earlier), DMOZ (Open Directory Project).

(3)Hybrid Search Engines

These combine crawler-based results and human-powered directory listings to provide better search results.

Example: Yahoo (earlier version)

Crawler-Based Search Engines – How It Works

  • Combine crawler-based technology and human directory listings.

  • Use automated crawlers to scan and index websites.

  • Also include manually reviewed websites in their database.

  • Store collected data in an index.

HOW WORK SEARCH ENGINE

(1)  CRAWLING
Search engines use automated bots called crawlers or spiders to scan websites on the internet.

Crawling – How It Works (Bullet Points)

  • Search engines use automated programs called crawlers or spiders.

  • Crawlers start by visiting a known list of web pages.

  • They read the content of each page.

  • They analyze keywords, headings, links, and images.

Example :

Google (Google crawler)

(2) INDEXING

The information collected by crawlers is stored in a large database called an index.

Indexing – How It Works

  • After crawling, the collected data is sent to the search engine database.

  • The search engine analyzes the content of each web page.

  • It checks keywords, titles, headings, images, and links.

  • The page information is organized and stored in a large database called the index.

  • The index works like a digital library of web pages.

(3) RANKING
 The search engine ranks pages based on relevance, quality, keywords, backlinks, and user experience.

Ranking – How It Works

  • When a user enters a search query, the search engine checks its index.

  • It compares the query with indexed web pages.

  • The search engine uses special formulas called algorithms to decide rankings.

  • Pages are evaluated based on keyword relevance.

  • It checks the quality and originality of content.

  • It considers the number and quality of backlinks.

Types of Search Engine Optimizations

There are 3 types

(1)On-Page SEO

On-Page SEO is the process of optimizing content and elements inside a website to improve its search engine ranking.

How its works

  • Optimization done inside the website

  • Keyword research and placement

  • High-quality content

  • Title tags and meta descriptions

  • Heading tags (H1, H2, H3)

    (2)Off-Page SEO

    .Activities done outside the website

  • Building backlinks

  • Guest posting

  • Social media sharing

  • Influencer outreach

  • Brand mentions

(3)Technical SEO

Technical SEO is the process of optimizing a website’s technical structure to help search engines crawl, index, and rank it properly.

How its works

  • Improving the technical structure of the website

  • Website speed optimization

  • Mobile-friendly design

  • XML sitemap