Extra segment's function in 8086/8088 processor tutorial

Question
What is the function of the extra segment in a 8086/8088 processor?

Answer
Extra Segment (ES) is one the the segment available in 8086/8088 microprocessor. The other segment include Data Segment (DS) , Code Segment (CS) and Stack Segment (SS).

ES is a 16-bit register containing address of 64KB segment, usually with program data. By default, the processor would use data segment from the memory whenever it is called. For example if the instruction is MOV AX, (1000h)