Assume in assembly

"Each variable identifier defined in the Data Segment actually represents an offset (also known as a valid address), which corresponds
The combination of data segment values points to a memory address. In a program, the assume pseudo command is used to specify a default segment address. Once you specify the segment name of a data segment to a segment register (such as assume DS and data1), then when you use the variables defined in this data segment (data1, the compiled program automatically combines it with the segment value (representing a segment address) in this segment register (DS. "

 

Note: Before using assume, you must assign valid values to DS so that assume is correct !!