Office Politics ?

Can anyone tell me why must there be office politics ? What is politics btw ? If someone do not quite see eye to eye with another, I think they should just talk it out instead of talking behind each other’s back correct ? That is not a difficult thing to do isn’t it ? Perhaps, it is difficult… especially in this world we live in, where we see people step and climb above one another to go for the top-most position. I’m not joining this stepping and climbing exercise, am not in the least interested in it at all. I know I have a daddy in heaven who has good plans in store for me, every step of the way. Guide my every step daddy.