Technically, content is every piece of text and media that is distributed/displayed via your site, whether that be in the component, module, mambot/plugin, or template. In Joomla, when someone says content, they are probably referring to the core content component and the content items that are entered into that component and displayed on your site.
How to Add Meta Tag Robots in Joomla 2.5 withouth extra tools
By default Joomla 2.5 does not add the robots meta tag in the header and you have no handy tool by default to do it in one place, unless you don't use some add-on which let you do this easily.
But what if you prefer to do it yourself, bare-handed, without seeing even some code? You might be surprised, but in fact in Joomla 2.5 it's very easy to set up meta tag robots for your home page and content articles.
More PHP code snippets to be used in your template
In a previous article about useful PHP code snippets to conditionally add things to your template I allready listed couple of tricks, let's add a couple more to them!