Ruby is an interpreted, high-level, general-purpose programming language. It was designed and developed in the mid-1990s by Yukihiro Matsumoto in Japan. According to the creator, Ruby was influenced by Perl, Smalltalk, Eiffel, Ada, and Lisp. It supports multiple programming paradigms, including procedural, object-oriented, and functional programming. It also has a dynamic type system and automatic memory management. An assertion is one of the most important things in software development. Assertions are used to check for conditions that should never occur during normal execution. If an assertion fails, it indicates a bug, and the program should be terminated immediately.