AutoCad 2D :: Difference Between Multiple And Single Line?

except for the quantity of the line . the case is I was taught to make a title block tempelate. For each single item, like text"STUDENTS NAME " or "PART NMAE" , and inluding the attributes, I was instructed to use single line text instead of mutliple line. I was told that single line won't change. What does it mean it won't change?

I feel that single line is more precisely controlled ,while the multiple line text is more ofen used in puting the notes in a drawing. But in what case use what I am confuesd. Especailly when make the tible block, It seems to use the single line text is the unique way to make each feature in its status.