The Lineup contains all the players of your fantasy team that are eligible to score points.
Your fantasy roster usually contains more players than you are able to put in your starting lineup. Each gameweek you have to decide if you start ’em or sit ’em. Because only the players in your starting lineup can score points. Every fantasy manager has to make hard decisions.
Players on the bench never score points, unless you have activated a bench booster. It’s also possible that players on the bench are auto subbed in when the gameweek is over and one of your starters did not play.