Variable is very useful for these cases:
Request in multiple environment.
Request has many dynamic parameters in url query or body.
A request depend on one or more requests.
Need change request's url/headers/body before sending it.
Variable is always a key-value object and use with a uniform format:
｛｛key｝｝, you can use variable in
Common Pre Request Script,
Pre Request Script,
｛｛key｝｝ will be replace to
Value of the variable before or after sending reqeust. Variable transfer workflow reference to: Variable Transfer Workflow.
Hitchhiker have three types of variable.