> ## Documentation Index
> Fetch the complete documentation index at: https://developers.activeprospect.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Variables

A variable is a key/value pair that is available to filters, rule sets
and mappings and in templates at run time while processing a lead.

Every lead is born with a standard set of variables, and additional
variables are added at run-time as leads are processed by each step in
the flow. The full set of variables are stored on every event (in the
`vars` property) generated during lead processing.

Variables are stored on events as nested objects and are referenced at
runtime using dot-notation. There are several top-level variable prefixes
that logically group variables.