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Joomla's ACL really has two pieces to it.

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One part is who can create, edit, delete, and publish what, and the other side of

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it is who can see what.

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So that side of it, the who can see what side, is controlled by something

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called access levels, and I just want to acquaint you with these access levels real quickly.

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So here under Users, if we go to Access Levels,

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by default, there are four access levels for our Web site.

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So Public, Registered, and Special have been around forever inside of Joomla,

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and Guest is new to this version of Joomla.

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So Public indicates that that is the public.

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Anybody who comes to visit the front-end to your Web site, this is

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information that anybody can see, and they don't have to be logged in to the Web site to see it.

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Registered means that you can log in to the front-end of the Web site; that's the

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registered user group side of this.

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The Registered access level controls who can see what on the front-end of the

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Web site once they are logged in.

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So that would actually include

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the Registered user group, as well as Authors, Editors, Publishers, Managers,

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Administrators, and Super administrators; all of them have the ability to log in to

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the front-end of the Web site.

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All of them can see the content that's here set up for with the

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Registered access level.

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Special means that user groups of Author and higher can see that particular

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content; so Authors, Editors, Publishers, Managers, Administrators, and Super

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administrators, or Super Users, can all see that particular information on the Web site.

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Special is used a lot here in the back-end for controlling who can see the modules.

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So like the menu module here at the top of the screen in my administrator side,

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the access level associated with that is Special.

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And I recommend that you don't really use Special for the front-end of the

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Web site. It's become an incredibly useful thing on the back-end of Joomla in particular.

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And then the last level, which is new this time around, is the Guest level, and

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the Guest level indicates that you are new to the Web site, and you are looking

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at something, but this particular item should display only if you are not logged

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in, and if you are logged in,

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then this particular item would not display at all.

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So you might have, as we will have later on in this video, you might have a link

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that says become a distributor.

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And that's available if you're not logged in to the Web site.

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But if you log in to the Web site, that link goes away.

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If you log in, obviously you're a distributor,

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so that link that says become a distributor, it's gone, and it's replaced with,

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perhaps, some other information, and that's what we will be building later on in

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this particular chapter.

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So remember that access levels have to do with who can see what; that's all. Who

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can see what, either of the front-end or the back-end to the Web site.

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And everything else; creating, editing, deleting, publishing, content, logging in,

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a whole bunch of other things, that is all under control of the permissioning

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system inside of Joomla

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in the core permissions.