What does 'fullback' mean in soccer/or football?

Are a sweeper and a stopper 'fullbacks'? What about a left back and a right back in the 4-4-2 formation? Aren't they fullbacks? Are there only two fullback or four fullbacks in the 4-4-2 formation?

In soccer/football, the term "fullback" refers to a defensive player who plays in the outermost positions of the defense, typically on the left and right sides of the field. Their primary role is to provide defensive cover and prevent opposing players from advancing towards the goal.

Now, let's break down the different positions and roles within the fullback position:

1. Sweeper: A sweeper is a defensive player positioned behind the other defenders. Their primary task is to clear the ball and provide support to the central defenders. While they are an essential part of the defense, they are not considered fullbacks.

2. Stopper: The stopper is a central defender who plays a more aggressive and physical role. Their main responsibility is to mark and engage with opposing forwards. Like the sweeper, they are not typically classified as fullbacks.

3. Left back and Right back: In the 4-4-2 formation, the left back and right back are indeed considered fullbacks. They play on the left and right sides, respectively, of the defensive line. Their primary duty is to defend against wingers or wide attackers and prevent them from crossing the ball into the middle. Additionally, they may contribute to the attack by overlapping and providing crosses from the flanks.

In a 4-4-2 formation, there are usually two fullbacks, a left back, and a right back. They work alongside the central defenders, forming a line of four players at the back. Together, they aim to maintain defensive solidity while also supporting the team's attacking efforts.

To conclude, in the context of soccer/football, a sweeper and a stopper are not typically classified as fullbacks, while the left back and right back in a 4-4-2 formation are considered fullbacks. Therefore, there are usually two fullbacks in a 4-4-2 formation.