Playing a movie in a page within the browser?

How would I go about making a video playable within a user's browser? I have an already-existing site and a video file for the site. I'd like a user to go to a certain page and the video would play directly on that page without the user having to download the file and play it with an external program.

A good example are movie trailer pages– you go to the page and, after loading (streaming?), the video plays directly in the browser.

m19

 

Doesn't the browswer being used have somethign to do with this? I know some types of movies show automatically in my browser in Firefox, but when I look at the same site at home on Safari, I can download the video and watch it from my hard drive.

Sorry, I don't know a ton about websites.

 

http://www.html-reference.com/EMBED.htm