| 71. | ROI | Return on Investment. |
| 72. | Robot | a programme used by a search engine to roam the web, finding, ranking, and indexing web pages. (spider, webcrawler, crawler, web-bot, bot) |
| 73. | Robots.txt | a file used to exclude some or all robots from crawling some or all the files or directories on a website. This file should be placed in your website's root directory. |
| 74. | Sandbox | allegedly used by one large search engine as a probation period for new sites. Gaining a high PR is inhibited during this period. |
| 75. | SEM | Search Engine Marketing; encompasses SEO and further marketing methods, eg. paid advertising options. |
| 76. | SEO | Search Engine Optimisation. |
| 77. | SERPS | Search Engine Ranking Positions – refers to the natural search results |
| 78. | Search engine | strictly, the programme(s) used to provide internet users with a search facility. Nowadays, the megacorporation that owns same. |
| 79. | Search engine friendly | a web page designed and optimized for high search engine rankings. Such pages are rich in keywords and structured for ease of crawling. |
| 80. | Spamming | The sending of unsolicited bulk email.The term used by search engines to describe methods for increasing rankings, that they consider unacceptable. |
| 81. | Spider | a programme used by a search engine to roam the web, finding, ranking, and indexing web pages. (spider, webcrawler, crawler, web-bot, bot) |
| 82. | Splash Page | A page displayed for viewing before reaching the main page. |
| 83. | Stemming | The inclusion of word variations and plurals of a term. A search can include all words that come from the same "stem" word. Examples: act acts, acting, actor |
| 84. | Stop word | small common word, a, as, the, ignored by search engines when indexing web pages and processing search queries. |
| 85. | Traffic | visitors to a website, measured in a variety of ways, including unique visitors and total page views, or the rather meaningless 'hits'. |
| 86. | Weblog | We blog - a free web space used for user to publish their own diary. |