An email address, such as the address of your support desk.
In the editor

Besides the settings every field shares, an email field has:
| Setting | What it does |
|---|---|
| Placeholder | Grey text in the empty input. |
| Default value | The address the option gets when you save the menu, as long as it has no value yet. |
| Field style | The width of the input: Regular, Small, Large or Options. |
On the options page

The input is an email input: the browser checks the address before the page is saved.
The value
Stores the address, cleaned with sanitize_email(). An address that is not valid becomes empty.
On your website
The shortcode and blocks show the address hidden from simple spam bots. With link="1" or a text, the shortcode makes it a mailto: link. Bound to the URL of a button, it becomes a mailto: link too.
[aop_option name="support_email" link="1"]
[aop_option name="support_email" text="Email us"]
$email = get_option( 'support_email' );
printf( '<a href="mailto:%1$s">%1$s</a>', esc_attr( antispambot( $email ) ) );