StringTemplate

StringTemplate["string"] yields a TemplateObject expression that represents a string template to be applied to arguments. 

StringTemplate[src] uses File[…], URL[…] or CloudObject[…] as the source for the string template.

StringTemplate[form,args] yields a TemplateObject with arguments, suitable for cloud deployment or other evaluation.

Please visit the official Wolfram Language Reference for more details and examples on core symbols.