Efofex products know how to analyze what you type and determine which bits are text and which bits are equations. This allows you to type something like...
The equation is y=x2/4
and have it automatically formatted as
Notice that not only is the relevant part identified as an equation, it is also produced using a different font.
Many users want to have normal text and equations formatted differently and this creates an issue when you want to standardize your output. Font styles allow you to make the process of formatting your text much quicker.