A variable is a placeholder for a value that can be used in a blueprint or a script. A variable can be defined at the global, project, or blueprint level. A global variable is available to all projectsand blueprints, while a project variable is available to all blueprints within a project, and a blueprint variable is available only to the blueprint where it is defined. To make a variable visible to a blueprint, the developer needs to share the variable with the project that contains the blueprint. This can be done by going to the Variables page in the Calm UI and clicking on the Share button next to the variable name. Then, the developer needs to select the project from the drop-down list and click on Save. References: Nutanix Certified Professional - Multicloud Automation (NCP-MCA) Exam Blueprint Guide, page 14; Nutanix Calm User Guide, section 3.2.