A language which is close to that used within the computer is Low-level language
A low-level programming language is a programming language that provides little or no abstraction from a computer's instruction set architecture—commands or functions in the language map closely to processor instructions. Generally this refers to either machine code or assembly language.
Low-level languages can convert to machine code without a compiler or interpreter second-generation programming languages use a simpler processor called an assembler and the resulting code runs directly on the processor. A program written in a low-level language can be made to run very quickly, with a small memory footprint. An equivalent program in a high-level language can be less efficient and use more memory.