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Joomla's ACL revolves around certain additional parameters that are in

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the back-end of Joomla

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that we haven't even touched yet.

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There are users; of course, those are the people who log into the Web site. There

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are user groups; every user belongs to a user group, and permissions are assigned

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to those user groups.

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There are core permissions that are available; these are the things that people

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can and cannot do on the Web site, and there are access levels.

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And so I am going to give you a quick overview of what user groups are, and

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then in the next video, I'll show you how to create a user once we know what

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the user groups are.

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So here in the back-end of Joomla,

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we're going to start by going to Users > Groups, and this will show us all of the

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default user groups that are available to us here in Joomla,

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again, by default. There is absolutely no reason to keep any of these groups. You

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are more than welcome to go through and delete whatever you've got here.

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Just remember, you can't delete the Super User group if you've already got

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somebody in it; that would be a very bad thing.

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But the groups that are here by default are the groups that were available in

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Joomla! 1.5, with one new addition.

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So let me tell you about the groups that we've all known and loved for so many years.

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Public means anybody who is coming to the front-end of your Website; they just

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come to see the Web site. They aren't interacting with the login screens at all.

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These are just the people that arrive on the Web site.

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Registered users are one step up from this.

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Registered users are allowed to log in to the Web site, but they can't edit any

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articles, or create articles, or do anything else; just logging in, and sometimes

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just logging in is all you need, because that will allow you to see information

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that perhaps somebody without a login would not be able to see.

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Authors are able to create new content for the Web site, and they can edit their own content,

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but they can't edit any other pages on the Web site. In other words, they can't

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edit articles they didn't write, and authors cannot publish what they write.

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So anything that they write on the Web site is unpublished by default, and it has

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to be reviewed by somebody before it can be published.

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Editors are able to create new content for the Web site, as well as edit any

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content that's available on the Web site.

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So anybody's content, written by anybody, anywhere, an Editor can edit.

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But again, they can't publish any content, or unpublish content. That is the

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job of a Publisher.

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The Publisher inherits all of those permissions from before.

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They can log in to the front-end, they can create content, they can edit

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anybody's content, and they can publish, and then unpublish content.

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So Registered, Author, Editor, and Publisher all have to do with the front-end

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of the Web site, logging in from the front-end.

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None of those user groups are allowed to login from the back-end of the Web site.

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People that can login to the back-end of the Web site include the Manager,

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Administrator, and Super Users.

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So, when the Manager logs in to the back-end of the Web site, they get a stripped

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down version of the menu that's seen here.

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For example, they are allowed to create content, and they are allowed to put

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things in the Media Manager, and create new menu items,

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but a manager is not allowed to, for example, manipulate the components, they

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can't touch the templates, they may have no access to the modules.

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So a lot of things are stripped out from Managers, although they can log in to

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the back-end of the Web site.

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Administrators can do almost everything that we have been seeing here inside of

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Joomla, except Administrators don't have access to the global configuration, and

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many of the Options screens.

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So like the article Options, the module options;

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the template options; all of the options that we've been seeing in practice.

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And then, of course, finally, there are Super Users.

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And Super Users can log in anywhere, see anything; do anything.

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So those are the default groups that came with Joomla! 1.5.

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We've since added a new group;

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this is a new group to Joomla! 3,

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and that is the Guest group. And the concept behind the Guest group is,

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sometimes you'd like some content that shows up on the Web site by default when

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people are visiting the Web site, and they are not logged in at all,

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but when someone is logged into the Web site, you'd like that content to

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disappear, and you'd like people to be able to see a different option instead,

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and that is the function of the Guest group.

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I am going to go through how you can use the Guest group in your Web site a

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little bit later on in the videos.

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So that's a brief overview of what the user groups are, and I am going to go

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ahead and put these user groups to work in the next video, where I create a

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new user.