There are two options for including videos and other media inside a post or page.
The first option requires you to enable auto-embeds on the Media Settings page as described in our Basic Blog Set-Up » Advanced Settings overview. With this option you only need to include, on its own line, a link to the media you want to embed.
The second option allows you a little more control over your embed. This involves wrapping the link in an embed shortcode — use this option when you want to retain control of the dimensions of the embed by declaring height and width properties, like so:
[embed height="180" width="320"]. . .[/embed]
Of course, be sure to replace the ellipsis with an actual link.
Bear in mind that this only works with sites that have been whitelisted by WordPress, but this list includes all the usual suspects, like
- YouTube (only public videos – “unlisted” and “private” videos will not embed)
- Flickr (both videos and images)
For the most recent list, please visit http://codex.wordpress.org/Embeds.