Embed tags allow you to add movies, music, flash files, pictures, widgets, your Twitter and Facebook feeds, and all sorts of gadgets to your web pages. Embed tags in HTML (the language used to write webpages) are written like this: < embed src="helloworld.swf" > You can read more about embed tags at W3 schools.
Whenever you see embed tags it usually indicates that the gadget can probably be added to your blog or web page by adding the code following the < embed > tag on your page. A good example is the embed tag you find in a YouTube video. As long as the creator of the video hasn't disabled the embed code you can grab the video's embed code and add the video to your blog post or web page. In my next post I will show you how to add a picture slideshow using an embed tag to a web page or blog.