Tokens are used to define the structure of a program, and they are used by the compiler or interpreter to parse the program and generate machine code or execute the program.
Here are some examples of tokens in different programming languages:
- In C++, "int" is a keyword, "x" is an identifier, and "5" is a literal.
- In Python, "print" is a keyword, "x" is an identifier, and "5" is a literal.
- In HTML, "" is a symbol, "hello" is an identifier, and "world" is a literal.
In summary, tokens are the basic units of syntax in a programming language, and they are used to define the structure of a program.