AMPL is a high-level algebraic modeling language for mathematical programming. It enables expressing optimization models in a natural mathematical notation close to textbook formulations. AMPL separates model structure from data, allowing the same model to be used with different datasets. Key features: support for linear, nonlinear, integer programming; interfaces with multiple solvers (CPLEX, Gurobi, MINOS, SNOPT); scripting capabilities for scenario analysis; extensive built-in functions. Model structure includes: sets, parameters, variables, objective, constraints. AMPL facilitates rapid prototyping, model maintenance, and allows users to focus on formulation rather than implementation details. Widely used in academia and industry for operations research applications.