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Keyword is a special word that has a special meaning and purpose. Keywords are reserved and are few. For example : if, else, elif etc.
Identifier is the user-defined name given to a part of a program like variable, object, functions etc. Identifiers are not reserverd. These are defined by the user but they can have letters, digits and a symbols underscore. They must begin with either a letter or underscore. For example : chess, _ch, etc.