Caching of website is checked by “cache:school4seo.com”. This is used to see cache status of website. Cache status indicate active participation of crawler on your website. If crawler is visiting your website daily and updating its data base with updates occurred on your website, it means your website is being cached frequently.
But if you are updating your website but it is not being shown in “cache”, it means Google is not prioritizing to your new update occurred on your website.
If your website has not been being cached for a long time, it means your work to get website ranked, is going waste. For effective Search engine optimization, your website should be kept on cached.
Now the question is raised, how to get website cached? Answer is, by showing importance of updates to crawler.