Although it may seem unlikely to some of us, assembly language is still used for writing selected portions of new programs. In an article published not very long ago, the author says ...

We all probably know that for ultimate control and maximum performance, you need assembly language ... up your toolchain and creating a simple program that does almost nothing.

Many older programs were written in assembly by people who didn’t have C (or any other high level language) compilers, or didn’t trust them. Aside from that it’s less useful than you think ...