i started recently learning UWP, and i see that it's just WPF or same as it at least, with some little differences, and while reading about UWP i usually encounter this Keyword "WinRT" defined as being a Microsoft Technology that is related to UWP. but none of the articles i've read gives a clear idea of what is WinRT. nor the Difference between WPF and UWP.
Can anyone please be generous to explain that to me.
You can find multiple answers under this topic:
Almost everything is covered in that topic about all the five different technologies, so better you read that one first and see if it answers your question or not.
Is a windows desktop framework within .Net Framework starting from v3.0. WPF uses XAML language for its UI drawing, and C# or VB.NET as a back-end programming language.
It's a new and evolved "universal" framework targeting Windows 10 (both Desktop & Phone). Universal windows apps are able to run on all devices running Windows 10 (PC, Mobile, Tablet, XBox...etc).
By the way UWP is an improved/evolved framework built on top of WinRT (which was introduced on Windows 8.1). But WinRT is not universal (cross device) like UWP.