Directory services are widely used for information management. An alternative version of X.500 suit approved protocol DAP is LDAP that offers a system administrator a way to centralize and make available all sorts of infrastructure information.
As simple the name sounds, so complex is the infestation. Rootkits are programs that are infested on computers that allow someone to extract admin-level access to the system without the knowledge or consent of the end user.
The one certainty about SEO processes is that it provides no guarantee. No matter how skilled an SEO professional is or how experienced an SEO agency is, when it comes to written word, no one can give assurances.
Just as a book has a table of contents, a website has a sitemap. It is basically a web page that acts as a directory that contains all the links to all documents and files of the website.