They allow you to use the same name in different parts of your program without any issues ... While it's common to see begineers use std:: in C++ to refer to the standard library, some developers use ...

1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Tools\MSVC\14.28.29910\include\xlocbuf(223,50): error C2039: 'seekdir': is not a member of 'std ...