An integer type supporting values 0 to 255 System unit
  type Byte = 0..255;
The Byte type is the smallest form of integer, occupying 8 bits (1 byte) of storage.
It supports only the positive integers from 0 to 255.
Related commands
Cardinal The basic unsigned integer type
Int64 A 64 bit sized integer - the largest in Delphi
Integer The basic Integer type
LongInt An Integer whose size is guaranteed to be 32 bits
LongWord A 32 bit unsigned integer
ShortInt An integer type supporting values -128 to 127
SmallInt An Integer type supporting values from -32768 to 32767
Word An integer type supporting values 0 to 65535
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Example code : Showing maximum and minimum byte values
  min, max : Byte;
  // Set the minimum and maximum values of this data type
  min := Low(Byte);
  max := High(Byte);
  ShowMessage('Min byte value = '+IntToStr(min));
  ShowMessage('Max byte value = '+IntToStr(max));
Show full unit code
   Min byte value = 0
   Max byte value = 255
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