Do the slashes (/) in some of the html tags mean something?

I'm a hobby webist and do quite a bit of learning.
I started learning about forms and noticed something I hadn't seen before.
There are some tags (e.g. col/, input/, img/) that have a slash at the end of the tag.  I've used the for some time without and haven't noticed a difference.
I there some reason some of the tags have a slash?
Tom

Use the coding method supported by your document type declaration (DTD).
In most cases this is either HTML or XHTML.
HTML code (no slash):
<img src="some-image.jpg>
XHTML code (with slash)
<img src="some-image.jpg" />
XHTML tutorials:
http://www.w3schools.com/xhtml/
Nancy O.
Alt-Web Design & Publishing
Web | Graphics | Print | Media  Specialists
http://alt-web.com/
http://twitter.com/altweb

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