Updating perl modules
Bootstrap and Common libraries are defined as Drupal core and all other functionality is defined as Drupal modules including the system module itself.
In a Drupal website's default configuration, authors can contribute content as either registered or anonymous users (at the discretion of the administrator).
On October 15, 2014, a sql injection vulnerability was announced and update released.The name came from the now-defunct Web site, whose code slowly evolved into Drupal.Buytaert wanted to call the site "dorp" (Dutch for "village") for its community aspects, but mistyped it when checking the domain name and thought the error sounded better. Dean Space used open-source sharing of Drupal to support a decentralized network of approximately 50 disparate, unofficial pro-Dean websites that allowed users to communicate directly with one another as well as with the campaign.Before updating it is highly recommended to take backup of core, modules, theme, files and database.If there is any error shown after update or new updates is not compatible with a module, then it can be quickly replace by backup.
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Thus, it can be extremely important to apply these updates quickly and usage of a tool to make this process easier like drush is highly recommended.