User Guide:

What are Audiences in iRealty?

Audiences allows you to create, manage and save specific smart filters to allow you to target exactly who you want when you are sending out an email.

There are two audience options:

Custom Filters - This will save your audience as a smart filter that you can select from the Smart Filter list when sending
Presets - This will also save in the smart list, but will also appear as an easily selectable option when opening the smart filter interface

There are a few options for creating and saving a smart filter:

When sending
When you are on the first sending page and are selecting who you want to send to, you can select the Smart filters option and then select Create Smart Filter
From the Subscribers page
You can access the smart filters from clicking on Subscribers, then Filters and Create Smart Filter
From the Audiences page
If you hover Subscribers and select Audiences you can create and save either a smart filter or preset

A preset is the same as a smart filter, but it will be the first thing you see when you open the Smart Filter interface.
These are the default presets in the account which are commonly used filters throughout the platform:

When you start creating your own they will show up instead of the defaults:

You can swap between the default and created presets by toggling the Show/Hide Global button in the top middle.