This document discusses different types of programming languages: 1) Machine language is the lowest-level language understood directly by computers consisting of numbers, while assembly language uses symbolic representations that are closer to machine language. 2) High-level languages resemble everyday language and require less detailed computer knowledge, allowing programmers to focus on problem solving. Popular examples are BASIC, COBOL, FORTRAN, and newer object-oriented languages. 3) Non-computational languages like HTML and BNF are usually not considered programming languages, but their instructions are often embedded within programming languages.