From Lazarus-ccr

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A data type is a classification of a variable or constant. There are certain data types that are predefined by any Pascal compiler (because you need them to make everything else). These are:

• byte - an unsigned number in the range 0 to 255
• char - Single character
• integer - a whole number. FPC currently uses 4 bytes for integers
• real - a number which may have a decimal point and possibly an exponent
• cardinal - an unsigned whole number,ie it must be positiv
• set - a collection of related elements; size depends on number of elements
• pointer - a reference to a location in memory, generally used for dynamic variables
• record - a combination of the above data types collected together
• class
• object - a hybrid entity that may contain data and procedures to manipulate that data

Other data types are generally made with some combination of the above. FPC adds additional data types.