Sort out those filenames

Search engines can't interpret images*, audio and video so if you're embedding multimedia on your site, it helps to give them a helping hand to identify what that content is.  One of the ways they do that is by looking at the filename for the content.

So if you've got an exclusive photo of a new-born haggis, don't just copy the pic straight off your camera and onto your website with the filename IMG4043.jpg.  Rename it to something meaningful, like baby-haggis-emerging-from-shell.jpg, to give the search engines a chance of understanding what's in the image.

Presumably the multimedia file is relevant to your business, so try to include one of your keywords or keyphrases in the filename.  If we just called that image baby-emerging-from-shell.jpg, omitting the word haggis, the search engines won't identify the real niche that it's relevant to.

It's best to separate words using hyphens or underscores to separate words - after all, that's how most blog and CMS systems  construct URLs from your content titles, and it's what URL rewriting tools do to build meaningful URLs from product catalogues, so we know search engines are good at interpreting words separated that way.

*Though they are working on it