1. A parser generator that is compatible with YACC. Bison is a general-purpose parser generator that converts a grammar description for an LALR(1) context-free grammar into a C program to parse that grammar. Once you are proficient with Bison, you may use it to develop a wide range of language parsers, from those used in simple desk calculators to complex programming languages. Bison is upward compatible with Yacc: all properly-written Yacc grammars ought to work with Bison with no change. Anyone familiar with Yacc should be able to use Bison with little trouble. From Debian 3.0r0 APT

2. Bison is a general purpose parser generator that converts a grammar description for an LALR(1) context-free grammar into a C program to parse that grammar. Bison can be used to develop a wide range oflanguage parsers, from ones used in simple desk calculators to complex programming languages. Bison is upwardly compatible with Yacc, so anycorrectly written Yacc grammar should work with Bison without any changes. If you know Yacc, you should not have any trouble using Bison. You do need to be proficient in C programming to be able to use Bison. Bison is only needed on systems that are used for development.If your system will be used for C development, you should install Bison. From Redhat 8.0 RPM