XSLT

XSLT an XML-based, declarative and functional programming language.

declarative programming

A style of programming that concentrates on what to do, rather than how to do it, as opposite to imperative programming.

A common example of declarative programming would be an HTML document (which describes the structure of the page, but not how to actually construct the view.
At least, in principle.)

imperative programming

In imperative programming is traditional way of programming, a sequence of instructions to be executed.
For ex
do this task
do that task
do another task

imperative programming is about telling a computer how to do something

functional programming

In functional programming rather than presenting a program as a series of steps, it's represented with interdependent math-style functions,
where you set one value, a variable, and all the contingent values snap into place, like a spreadsheet.

Programs are viewed as descriptions of problems rather than instructions.

What type of files is .rar extension?

rar is another archive mechanism to save the space.
Download the archive binary from the following location.