Answer / Vijayendra Kumar Gautam

In Ansible, you should use `{{ }}` for variable interpolation. It allows you to reference variables within your playbooks or templates and have their values substituted at runtime. For example:
```yaml
- hosts: webservers
vars:
server_name: mywebsite.com
tasks:
- name: Set hostname
hostname: {{ server_name }}
```
In the example above, the `server_name` variable is interpolated and its value (mywebsite.com) is used to set the hostname on the webservers.

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