Question: How can I add an icon to my Rails application (to show in tabs when opened in a browser, etc.)?

Answer: 
You can use [Favicon Rails](http://apidock.com/rails/ActionView/Helpers/AssetTagHelper/favicon_link_tag) helper:

```
<%= favicon_link_tag %>

```

Or if you want another image than favicon.ico

```
<%= favicon_link_tag 'another_image.ico' %>

```
You're talking about a `favicon`.

Add this in the `head` part of your layout:

```
<link rel="shortcut icon" href="/path_to_your_pic"/>

```