Apply a string template with slots named a and b:

An equivalent form using TemplateApply:

The StringTemplate is not needed inside TemplateApply:

Apply a string template to positional arguments:

An equivalent form:

The expression inside <* ... *> is evaluated when the string template is applied:

Include a template slot as well as an expression in the template string:

Values from the association can be used in the template expression:

Rule delayed can be used to delay computations:

Expressions are spliced into the string using TextString:

File is fully supported:

Templates can be hosted in the Wolfram Cloud:

CloudObject can be directly used by TemplateApply:

The second argument of StringTemplate can be used to bound data to the template:

URL can be used to fetch templates:

StringTemplate evaluates to a TemplateObject:

If you deploy a template with data, each time you visit it TemplateApply will render the content again:

TemplateApply can be used to parse and apply a string template in one step:

Data in the second argument of StringTemplate takes precedence over arguments in TemplateApply:

You can deploy a StringTemplate to the cloud. When you visit the URL, TemplateApply will render the template on each visit: