to other tutorials on your blog regarding file management.
showing ZIP vs. RAR vs. 7Z compression speeds. to other tutorials on your blog regarding file management
A free, open-source alternative that can extract (open) RAR files but cannot create them due to licensing restrictions. 7Z compression speeds
The go-to lightweight solution for macOS users to open RAR archives. The Verdict: When Should You Use It? The Verdict: When Should You Use It
Because RAR is a proprietary format, you usually need third-party software to handle it:
Since "U rar" is likely a typo or shorthand for "RAR" (a popular archive file format) or potentially related to telecom protocols (where "CCA-U/RAR" refers to Re-Auth Request messages), I have drafted a post focusing on the —the most common context for general users.
If you are sending a quick document to a colleague who isn't tech-savvy, stick with for the sake of compatibility.