A "Left Back" is a position in soccer (football) typically located on the left side of the defense. This player is responsible for blocking opposing attackers, supporting the center-backs, and often joining the attack by overlapping with wingers. They need to be quick, agile, and possess good tackling skills. In addition to defensive duties, a left back often contributes to offensive plays by providing crosses into the opponent's penalty area. Famous left backs include Roberto Carlos and Marcelo, known for their exceptional skills and contributions to their teams, both defensively and offensively.