Gartner defines the Application Security Testing (AST) market as the buyers and sellers of products and services designed to analyze and test applications for security vulnerabilities. Gartner identifies four main styles of AST: (1) Static AST (SAST) (2) Dynamic AST (DAST) (3) Interactive AST (IAST) (4) Mobile AST. The above technology approaches can be delivered as a tool or as a subscription service. Many vendors offer both options to reflect enterprise requirements for a product and service.