What does RB mean in soccer?

Answer 1

By "RB" I assume you're referring to right back, or the right defender. This positions main job is to defend. However, if the right side of the field is open you have the ability to run up the right side, and deliver a cross into the box (If you can do so) Some examples would be Ashley Cole on Chelsea (A team in England), who is very good at attacking via the flanks (the side lines) If you are not good with the ball at your feet you should be well able to put in a slide tackle, or steal the ball. Also you should be good in the air, or at headers to pick off long balls over the top by the opposing team.

Answer 2

RB means Right Back. A right back is player who plays on the right side of the defensive line. The right back is responsible for marking side midfielders and wingers and also can play the role of an extended winger too