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Back to data types.
A Word is a 16 bits unsigned integer value. It requires two bytes of memory space. Its maximal value is 65,535 ((2^16 - 1) or hexadecimal $FFFF (or 0xFFFF) and its minimal value is 0.
Nowadays Words are rarely used in arithmetic operations (because most of the CPU have some 32 bit registers, if not 64 bit), but they can be encountered in some API to encode some flags with logical operations (like in a set).
And some embedded systems.
A simple program using a word type variables:
w1 := 1;
w2 := $2ef;
writeln ( w1,'+', w2,' = ' , w1+w2);