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Search Engine Optimization (SEO) Basics

Helpful SEO Terms

The process of looking for new or updated web pages. Google discovers URLs by following links, by reading sitemaps, and by many other means. Google crawls the web, looking for new pages, then indexes them (when appropriate).

Automated software that crawls (fetches) pages from the web and indexes them.

The generic name of Google's crawler. Googlebot crawls the web constantly.

File size is a measure of how much data a computer file contains or, how much storage it consumes. Typically, file size is expressed in units of measurement based on the byte, such as kilobytes (kb) or megabytes (mb). 

This is the factor that can slow your website way down. A 15MB (megabyte) image is huge. A 125KB (kilobyte) image s much more reasonable. If your file size is really big, it’s an indicator that either your image dimensions are too large or the resolution is too high.  

The actual dimensions of your image, in pixels. You probably think of traditional printed photos as 4×6, 5×7, or 8×10. But on the web, the height and width are measured in pixels. So for example, a typical image on a website or blog might be 795×300 pixels.

Index Page In Your Site

index is the name used for the homepage of the website.

Google Indexing

To index is when Google fetches a page, reads it, and adds it to the index: Google indexed several pages on my site today. Basically, Google stores all web pages that it knows about in its "index". The index entry for each page describes the content and location (URL) of that page. 

Resolution is the quality or density of an image, measured in dots per inch (dpi). A professional printer might require images to be at least 300dpi. But most computer monitors display 72dpi or 92dpi, so anything higher than that is overkill and makes your image unnecessarily large. When a design program has the option to “save for web”, it means saving it at a low, web-friendly resolution.

Watch Writing for the Web

Want to learn more? Take our WEB-101 course, Writing for the Web!

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