Assembly language is a method of abstracting machine code instructions for a computer into commands recognizable by a human. Instead of dealing directly with bit sequences, programmers write programs in assembly by generating blocks of code using a small set of keywords (which are mapped to machine instructions by an assembler).
Assemblers not only relieve the programmer of remembering instruction codes, but allow symbolic reference to memory locations, further improving redability.
.data hello_message db 'Hello, World!',0dh,0ah,'$' .code main proc mov ax,@data mov ds,ax mov ah,9 mov dx,offset hello_message int 21h mov ax,4C00h int 21h main endp end main
Assembly programs are much easier to understand than their corresponding machine code instruction streams, which are just numbers, but they are much more difficult to comprehend than most general-purpose higher-level programming languages, such as the C programming language or Java. There are, however, higher-level programming languages such as APL that are unreadable by other than a specialist.