Use software like WinRAR or 7-Zip to extract the contents of the .rar file into a dedicated folder on your computer.
To help you get the exact look you need for your project, tell me: Font Arabic Hqpb Rar
RAR files are used to bundle multiple fonts into one convenient download, making it easy to store and transfer dozens or even hundreds of fonts simultaneously. Use software like WinRAR or 7-Zip to extract