Definition of chipleader
The chipleader is the player who is the chip leader in a tournament. The term chipleader is only applied to tournament poker and not to cash game play. In a cash game, even if a player has 6 times the starting stack, he is not called the chip leader or chipleader, but rather, he has a deep stack. The chipleader in a tournament is simply the player with the most chips.
The advantage of being a chipleader
Being a chipleader obviously has the advantage that we have more chips than all the other players, which is nice, but it also gives us a special aura. Players will often be afraid to play against us since we cover them all and can eliminate everyone. Being a chipleader allows us to play more hands more aggressively. In addition to being able to bluff at a higher frequency with a higher percentage of success, players are also less likely to bluff us. If you have 25,000 chips and a player with 2,000 chips bluffs you preflop by shoving all in, you may feel that even if you lose the hand, it won't affect you too much and decide to call the bet. Bluffing a chipleader is more risky.