A token is a string of characters, categorized according to the rules as a symbol (e.g., IDENTIFIER, NUMBER, COMMA). The process of forming tokens from an input stream of characters is called tokenization, and the lexer categorizes them according to a symbol type. A token can look like anything that is useful for processing an input text stream or text file.

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Tokens-based authentication is more relevant than ever. Examine the differences and similarities between cookie and token-based authentication, advantages of using tokens, and address common questions and concerns developers have regarding token-based auth.