How do I place content on archive pages but not on main page?

I would like to place content in a sidebar of my blog articles when they are viewed in the archive, but not show this content when the blog articles are shown on the main page of my site.

Can this be done?

Another approach: edit your theme files. archive.php can simply not call in the sidebar, and that will do what you’re asking.

Have a look at the Template Hierarchy for a view of what the individual files in a theme take care of.