FONTS

I Have been thinking about fonts lately

and only one thing stands out to me 

the there are so dammed many 

There is HELVETICA

and HERCULANUM

and IMPACT

and MONACO

and  CHANCERY

and AMERICAN TYPEWRITER

And you get my drift

So I  wonder what  the  purpose,

What is the reason or rhyme?

and why am I changing  fonts  all the time.