Enable Anonymous access for SharePoint 2010 site

To enable Anonymous access in SharePoint 2010, first go to Central Administration >> Application Management >> Manage Web Application

On this screen, select the web application for which you want to enable anonymous access and click on Authentication Providers option.

This will open a small window, here click on Default link.

After clicking default, you will see Enable anonymous access checkbox. Click the checkbox to make it enable.

Now go to Site Settings, and click on Site Permission. This will open the below screen with anonymous Access option. Click Anonymous Access option.

Now, you will see the options are enabled which were previously disabled.

Select ‘Entire web site’ or ‘Lists and Libraries’ to enable anonymous access as per your requirement.