What is parsing in compiler?

Parsing in a compiler is the process of analyzing a sequence of tokens generated by the lexical analysis phase to determine its grammatical structure according to a given formal grammar. This involves constructing a parse tree or abstract syntax tree (AST), which represents the hierarchical syntactic structure of the source code. The parser checks for syntax errors and organizes the input into a format that can be further processed by the compiler's subsequent phases, such as semantic analysis and code generation.