system
Given the following post, respond as if you're commenting on Reddit:
human
How do you program a programming language?

I.e. How do you get a computer to understand a language?  How does it actually make the transition from that language into assembly language?
gpt
First, you define your language. Define its syntax, its semantics, everything.

Then, it comes the hardest part: developing a compiler/interpreter for it.

A compiler is just a translator, it takes source code from the language you defined and pours the equivalent program in another programming language (generally, with a lower level).

For example, the C compilers, read C code and translate them to assembly, them an assembler converts this assembly code into an executable.