KOMPILER is a programming language and environment for teaching the principles of compiler design. The syntax and structure of KOMPILER are designed to help students understand how source code is transformed into executable programs through a multi-stage process involving lexical analysis, syntax analysis, semantic analysis, optimization, and code generation. The language supports the construction of an abstract syntax tree (AST) from input programs using S-expressions as a concise representation. It features tools for implementing various stages of the compilation process and visualizing their intermediate results step-by-step. KOMPILER helps students gain hands-on experience in creating functional compilers while learning advanced concepts in computer science.