Answer:
Reserved Words in Pascal
For example, the words, program, input, output, var, real, begin, readline, writeline and end are all reserved words.
In a computer language, a reserved word (also known as a reserved identifier) is a word that cannot be used as an identifier, such as the name of a variable, function, or label – it is "reserved from use". This is a syntactic definition, and a reserved word may have no meaning.
