AWS CloudFormation Concepts Condition Functions
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External
Internal
Overview
As it is the case for intrinsic functions, condition functions have a full function name, and a short form. For more details see:
Fn::If: !If
Fn::If: function can be used to conditionally specify a property.
Fn::If is only supported in the metadata attribute, update policy attribute, and property values in the Resources section and Outputs sections of a template.
Fn::And: !And
Fn::Equals: !Equals
!Equals ['something', !Ref SomethingElse]
Fn::Not: !Not
Fn::Or: !Or
Expressions
Expressions can use pseudo-parameters, template input parameters and mappings. Expressions are useful when declaring Conditions. Other conditions can be referenced within conditions.