Google and search engines use spiders or bots to crawl and index a website. Search engines are smart yet, they don’t accept cookies; they cannot fill out forms, and they don’t necessarily understand JavaScript.

They cannot see the contents of images; they don’t have the flash plug-in installed, and they are easily confused by simple drop-down menus and other common elements of site design. If you want spiders to crawl your website and index all your webpages, you have to make it easy for them.

Site Crawlability

In order to eliminate crawling  issue, all content should be accessible within three mouse clicks of the home page. This isn’t the only rule, but it greatly improves site’s crawl rate, without making any other changes.

Tips to Improve Site Crawlability

Use Robots.txt File: Robots.txt files direct search engine spiders how to view and index your site and is the easiest way to increase crawl rate. You can specify a sitemap location so that search engines can easily discover important pages of your site.

Check Broken Links: Broken links within a site can cause crawl errors when the search engine spiders come to your site.

Check Markup Validation: Use proper markup validity of HTML, XHTML, which provides capability with browsers, among other things.

Session IDs: If you’re using session IDs on your site, make sure to store or place them in cookies instead of including them as part of your URLs. Session IDs normally cause a single page of content to be visible at multiple URLs, and that would just obstruct the SERPs. Thus, search engines don’t like to crawl URLs with session IDs.

Avoid Flash Links: Search engine bots cannot read text on images inside Flash, so you must stick with HTML links.

Use Sitemaps: Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling.

Avoid Code Bloat: Normally, Spiders are smart in distinction code from content, but that doesn’t mean you should make it more difficult by having so much code that the content is hard to find.

A search-engine optimized site should not only be friendly to users but also various search engines. Design your website in a way that visitors can quickly find what it is they’re looking for. If your website seems poorly put together, its bounce rate grows, which may lead to missed profit opportunities.