Rendering is changing data into something <variable> -------> into "value".
Parsing takes raw data or input and converts it a data structure, or structures that can be analyzed.
Jinja2 - 101 - Intro to Jinja2 template building
Manual: https://media.readthedocs.org/pdf/jinja2/latest/jinja2.pdf
jinja2 module
With Python: ( use extensively by Ansible)
>>> from jinja2 import Template
>>> template = Template('Hello {{ name }}!')
>>> template.render(name='John Doe')
'Hello John Doe!'