+A **Lexer**, also known as a scanner, is the initial phase of a [compiler](/wiki/Compiler), transforming a stream of input characters into a sequence of meaningful [tokens](/wiki/Token). It identifies fundamental lexical units like keywords, identifiers, and operators, preparing the source code for the next stage of analysis.
+## See also
+- [Compiler](/wiki/Compiler)
+- [Token](/wiki/Token)
+- [Parser](/wiki/Parser)
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